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30secondsofcode
2019-09-28 10:39:04 +00:00
parent 744f6939b8
commit 8f7d1bb0c5
12 changed files with 102 additions and 92 deletions
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36
README.md
View File

@ -1723,8 +1723,8 @@ const join = (arr, separator = ',', end = separator) =>
i === arr.length - 2 i === arr.length - 2
? acc + val + end ? acc + val + end
: i === arr.length - 1 : i === arr.length - 1
? acc + val ? acc + val
: acc + val + separator, : acc + val + separator,
'' ''
); );
``` ```
@ -4272,10 +4272,10 @@ const getMeridiemSuffixOfInteger = num =>
num === 0 || num === 24 num === 0 || num === 24
? 12 + 'am' ? 12 + 'am'
: num === 12 : num === 12
? 12 + 'pm' ? 12 + 'pm'
: num < 12 : num < 12
? (num % 12) + 'am' ? (num % 12) + 'am'
: (num % 12) + 'pm'; : (num % 12) + 'pm';
``` ```
<details> <details>
@ -5487,11 +5487,11 @@ Throws an exception if `n` is a negative number.
const factorial = n => const factorial = n =>
n < 0 n < 0
? (() => { ? (() => {
throw new TypeError('Negative numbers are not allowed!'); throw new TypeError('Negative numbers are not allowed!');
})() })()
: n <= 1 : n <= 1
? 1 ? 1
: n * factorial(n - 1); : n * factorial(n - 1);
``` ```
<details> <details>
@ -6688,11 +6688,13 @@ jQuery(element).on('click', view.click); // Logs 'clicked docs' when clicked.
Creates a deep clone of an object. Creates a deep clone of an object.
Use recursion. Use recursion.
Check if the passed object is `null` and, if so, return `null`.
Use `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original. Use `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.
Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned. Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.
```js ```js
const deepClone = obj => { const deepClone = obj => {
if (obj === null) return null;
let clone = Object.assign({}, obj); let clone = Object.assign({}, obj);
Object.keys(clone).forEach( Object.keys(clone).forEach(
key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key]) key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])
@ -6700,8 +6702,8 @@ const deepClone = obj => {
return Array.isArray(obj) && obj.length return Array.isArray(obj) && obj.length
? (clone.length = obj.length) && Array.from(clone) ? (clone.length = obj.length) && Array.from(clone)
: Array.isArray(obj) : Array.isArray(obj)
? Array.from(obj) ? Array.from(obj)
: clone; : clone;
}; };
``` ```
@ -6789,13 +6791,13 @@ const deepMapKeys = (obj, f) =>
Array.isArray(obj) Array.isArray(obj)
? obj.map(val => deepMapKeys(val, f)) ? obj.map(val => deepMapKeys(val, f))
: typeof obj === 'object' : typeof obj === 'object'
? Object.keys(obj).reduce((acc, current) => { ? Object.keys(obj).reduce((acc, current) => {
const val = obj[current]; const val = obj[current];
acc[f(current)] = acc[f(current)] =
val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val); val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);
return acc; return acc;
}, {}) }, {})
: obj; : obj;
``` ```
<details> <details>
@ -6866,9 +6868,9 @@ const dig = (obj, target) =>
target in obj target in obj
? obj[target] ? obj[target]
: Object.values(obj).reduce((acc, val) => { : Object.values(obj).reduce((acc, val) => {
if (acc !== undefined) return acc; if (acc !== undefined) return acc;
if (typeof val === 'object') return dig(val, target); if (typeof val === 'object') return dig(val, target);
}, undefined); }, undefined);
``` ```
<details> <details>

16
snippet_data/snippetList.json
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@ -412,7 +412,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "d6cecd4bcef92ac6a01f89a4f766fbe1eb006a48ef5181d095cb2f59446f5ca5" "hash": "ba7a2908d8ec2f04f9734a12a4f71d3f5706f5b92e13b5716ebd43f97df4313c"
} }
}, },
{ {
@ -827,7 +827,7 @@
"type": "snippetListing", "type": "snippetListing",
"title": "deepClone", "title": "deepClone",
"attributes": { "attributes": {
"text": "Creates a deep clone of an object.\n\nUse recursion.\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.\n\n", "text": "Creates a deep clone of an object.\n\nUse recursion.\nCheck if the passed object is `null` and, if so, return `null`.\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.\n\n",
"tags": [ "tags": [
"object", "object",
"recursion", "recursion",
@ -835,7 +835,7 @@
] ]
}, },
"meta": { "meta": {
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} }
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@ -898,7 +898,7 @@
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} }
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@ -1037,7 +1037,7 @@
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@ -1273,7 +1273,7 @@
] ]
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} }
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{ {
@ -1678,7 +1678,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "9e39c6a3a8ec5b51c5e16f69107fc9e90b2697b2cf2689850872071bb968723e" "hash": "16c3b724b653dcb31f3e59f1664a59951abb15a93eb3697cade4d3ae0e63c532"
} }
}, },
{ {
@ -2820,7 +2820,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "3db3faac666ee61ab86c70766d2ab5d1293ffd818da87edb971bfff7a366364a" "hash": "362fddaa6244404741e84bca6fc442a101fdb642af53b299e8b9994d0d7162d8"
} }
}, },
{ {

30
snippet_data/snippets.json
View File

@ -568,7 +568,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "d6cecd4bcef92ac6a01f89a4f766fbe1eb006a48ef5181d095cb2f59446f5ca5" "hash": "ba7a2908d8ec2f04f9734a12a4f71d3f5706f5b92e13b5716ebd43f97df4313c"
} }
}, },
{ {
@ -1140,10 +1140,10 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "deepClone.md", "fileName": "deepClone.md",
"text": "Creates a deep clone of an object.\n\nUse recursion.\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.\n\n", "text": "Creates a deep clone of an object.\n\nUse recursion.\nCheck if the passed object is `null` and, if so, return `null`.\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const deepClone = obj => {\n let clone = Object.assign({}, obj);\n Object.keys(clone).forEach(\n key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])\n );\n return Array.isArray(obj) && obj.length\n ? (clone.length = obj.length) && Array.from(clone)\n : Array.isArray(obj)\n ? Array.from(obj)\n : clone;\n};", "es6": "const deepClone = obj => {\n if (obj === null) return null;\n let clone = Object.assign({}, obj);\n Object.keys(clone).forEach(\n key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])\n );\n return Array.isArray(obj) && obj.length\n ? (clone.length = obj.length) && Array.from(clone)\n : Array.isArray(obj)\n ? Array.from(obj)\n : clone;\n};",
"es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar deepClone = function deepClone(obj) {\n var clone = Object.assign({}, obj);\n Object.keys(clone).forEach(function (key) {\n return clone[key] = _typeof(obj[key]) === 'object' ? deepClone(obj[key]) : obj[key];\n });\n return Array.isArray(obj) && obj.length ? (clone.length = obj.length) && Array.from(clone) : Array.isArray(obj) ? Array.from(obj) : clone;\n};", "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar deepClone = function deepClone(obj) {\n if (obj === null) return null;\n var clone = Object.assign({}, obj);\n Object.keys(clone).forEach(function (key) {\n return clone[key] = _typeof(obj[key]) === 'object' ? deepClone(obj[key]) : obj[key];\n });\n return Array.isArray(obj) && obj.length ? (clone.length = obj.length) && Array.from(clone) : Array.isArray(obj) ? Array.from(obj) : clone;\n};",
"example": "const a = { foo: 'bar', obj: { a: 1, b: 2 } };\nconst b = deepClone(a); // a !== b, a.obj !== b.obj" "example": "const a = { foo: 'bar', obj: { a: 1, b: 2 } };\nconst b = deepClone(a); // a !== b, a.obj !== b.obj"
}, },
"tags": [ "tags": [
@ -1153,7 +1153,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "cdf3e756a5a73f7e6925d51b141089e991ef579ee8bfff99f194da8fb0ef6dc8" "hash": "5ab25ab96afd4f1f481fc318b5b290ba8c57a468ef6bca0ca200cfb7fcf3ba9f"
} }
}, },
{ {
@ -1229,7 +1229,7 @@
"fileName": "deepMapKeys.md", "fileName": "deepMapKeys.md",
"text": "Deep maps an object's keys.\n\nCreates an object with the same values as the provided object and keys generated by running the provided function for each key.\nUse `Object.keys(obj)` to iterate over the object's keys. \nUse `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.\n\n", "text": "Deep maps an object's keys.\n\nCreates an object with the same values as the provided object and keys generated by running the provided function for each key.\nUse `Object.keys(obj)` to iterate over the object's keys. \nUse `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const deepMapKeys = (obj, f) =>\n Array.isArray(obj)\n ? obj.map(val => deepMapKeys(val, f))\n : typeof obj === 'object'\n ? Object.keys(obj).reduce((acc, current) => {\n const val = obj[current];\n acc[f(current)] =\n val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);\n return acc;\n }, {})\n : obj;", "es6": "const deepMapKeys = (obj, f) =>\n Array.isArray(obj)\n ? obj.map(val => deepMapKeys(val, f))\n : typeof obj === 'object'\n ? Object.keys(obj).reduce((acc, current) => {\n const val = obj[current];\n acc[f(current)] =\n val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);\n return acc;\n }, {})\n : obj;",
"es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar deepMapKeys = function deepMapKeys(obj, f) {\n return Array.isArray(obj) ? obj.map(function (val) {\n return deepMapKeys(val, f);\n }) : _typeof(obj) === 'object' ? Object.keys(obj).reduce(function (acc, current) {\n var val = obj[current];\n acc[f(current)] = val !== null && _typeof(val) === 'object' ? deepMapKeys(val, f) : acc[f(current)] = val;\n return acc;\n }, {}) : obj;\n};", "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar deepMapKeys = function deepMapKeys(obj, f) {\n return Array.isArray(obj) ? obj.map(function (val) {\n return deepMapKeys(val, f);\n }) : _typeof(obj) === 'object' ? Object.keys(obj).reduce(function (acc, current) {\n var val = obj[current];\n acc[f(current)] = val !== null && _typeof(val) === 'object' ? deepMapKeys(val, f) : acc[f(current)] = val;\n return acc;\n }, {}) : obj;\n};",
"example": "const obj = {\n foo: '1',\n nested: {\n child: {\n withArray: [\n {\n grandChild: ['hello']\n }\n ]\n }\n }\n};\nconst upperKeysObj = deepMapKeys(obj, key => key.toUpperCase());\n/*\n{\n \"FOO\":\"1\",\n \"NESTED\":{\n \"CHILD\":{\n \"WITHARRAY\":[\n {\n \"GRANDCHILD\":[ 'hello' ]\n }\n ]\n }\n }\n}\n*/" "example": "const obj = {\n foo: '1',\n nested: {\n child: {\n withArray: [\n {\n grandChild: ['hello']\n }\n ]\n }\n }\n};\nconst upperKeysObj = deepMapKeys(obj, key => key.toUpperCase());\n/*\n{\n \"FOO\":\"1\",\n \"NESTED\":{\n \"CHILD\":{\n \"WITHARRAY\":[\n {\n \"GRANDCHILD\":[ 'hello' ]\n }\n ]\n }\n }\n}\n*/"
}, },
@ -1240,7 +1240,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "a4e1e33c0688dbf1ca231d9d8ea315ffed93b7f83f5d8cbf0714f10fdfeda8cf" "hash": "7a228b650ff668f697e524e0d27ebeff1bfa35e04333b6cd5e742ff63bfea25d"
} }
}, },
{ {
@ -1422,7 +1422,7 @@
"fileName": "dig.md", "fileName": "dig.md",
"text": "Returns the target value in a nested JSON object, based on the given key.\n\nUse the `in` operator to check if `target` exists in `obj`.\nIf found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.\n\n", "text": "Returns the target value in a nested JSON object, based on the given key.\n\nUse the `in` operator to check if `target` exists in `obj`.\nIf found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const dig = (obj, target) =>\n target in obj\n ? obj[target]\n : Object.values(obj).reduce((acc, val) => {\n if (acc !== undefined) return acc;\n if (typeof val === 'object') return dig(val, target);\n }, undefined);", "es6": "const dig = (obj, target) =>\n target in obj\n ? obj[target]\n : Object.values(obj).reduce((acc, val) => {\n if (acc !== undefined) return acc;\n if (typeof val === 'object') return dig(val, target);\n }, undefined);",
"es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar dig = function dig(obj, target) {\n return target in obj ? obj[target] : Object.values(obj).reduce(function (acc, val) {\n if (acc !== undefined) return acc;\n if (_typeof(val) === 'object') return dig(val, target);\n }, undefined);\n};", "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar dig = function dig(obj, target) {\n return target in obj ? obj[target] : Object.values(obj).reduce(function (acc, val) {\n if (acc !== undefined) return acc;\n if (_typeof(val) === 'object') return dig(val, target);\n }, undefined);\n};",
"example": "const data = {\n level1: {\n level2: {\n level3: 'some data'\n }\n }\n};\ndig(data, 'level3'); // 'some data'\ndig(data, 'level4'); // undefined" "example": "const data = {\n level1: {\n level2: {\n level3: 'some data'\n }\n }\n};\ndig(data, 'level3'); // 'some data'\ndig(data, 'level4'); // undefined"
}, },
@ -1433,7 +1433,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "484bd222e636e8a8409c30ddb1fe6e3fe72ab7a43f2edf089b2758d5e9bee528" "hash": "5f38360819f9225b887a94221bfee1a80f1bcc224a364440b3388f60491b03ba"
} }
}, },
{ {
@ -1748,7 +1748,7 @@
"fileName": "factorial.md", "fileName": "factorial.md",
"text": "Calculates the factorial of a number.\n\nUse recursion.\nIf `n` is less than or equal to `1`, return `1`.\nOtherwise, return the product of `n` and the factorial of `n - 1`.\nThrows an exception if `n` is a negative number.\n\n", "text": "Calculates the factorial of a number.\n\nUse recursion.\nIf `n` is less than or equal to `1`, return `1`.\nOtherwise, return the product of `n` and the factorial of `n - 1`.\nThrows an exception if `n` is a negative number.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const factorial = n =>\n n < 0\n ? (() => {\n throw new TypeError('Negative numbers are not allowed!');\n })()\n : n <= 1\n ? 1\n : n * factorial(n - 1);", "es6": "const factorial = n =>\n n < 0\n ? (() => {\n throw new TypeError('Negative numbers are not allowed!');\n })()\n : n <= 1\n ? 1\n : n * factorial(n - 1);",
"es5": "var factorial = function factorial(n) {\n return n < 0 ? function () {\n throw new TypeError('Negative numbers are not allowed!');\n }() : n <= 1 ? 1 : n * factorial(n - 1);\n};", "es5": "var factorial = function factorial(n) {\n return n < 0 ? function () {\n throw new TypeError('Negative numbers are not allowed!');\n }() : n <= 1 ? 1 : n * factorial(n - 1);\n};",
"example": "factorial(6); // 720" "example": "factorial(6); // 720"
}, },
@ -1759,7 +1759,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "0eac852db7a7add352b0d36677b22718b342ed9dc12f11780cac87e3b8260a05" "hash": "55b1ce0a892110d792a9487e40331774015525479faa2b8961f6c2ea6291c27b"
} }
}, },
{ {
@ -2310,7 +2310,7 @@
"fileName": "getMeridiemSuffixOfInteger.md", "fileName": "getMeridiemSuffixOfInteger.md",
"text": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\n\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.\n\n", "text": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\n\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const getMeridiemSuffixOfInteger = num =>\n num === 0 || num === 24\n ? 12 + 'am'\n : num === 12\n ? 12 + 'pm'\n : num < 12\n ? (num % 12) + 'am'\n : (num % 12) + 'pm';", "es6": "const getMeridiemSuffixOfInteger = num =>\n num === 0 || num === 24\n ? 12 + 'am'\n : num === 12\n ? 12 + 'pm'\n : num < 12\n ? (num % 12) + 'am'\n : (num % 12) + 'pm';",
"es5": "var getMeridiemSuffixOfInteger = function getMeridiemSuffixOfInteger(num) {\n return num === 0 || num === 24 ? 12 + 'am' : num === 12 ? 12 + 'pm' : num < 12 ? num % 12 + 'am' : num % 12 + 'pm';\n};", "es5": "var getMeridiemSuffixOfInteger = function getMeridiemSuffixOfInteger(num) {\n return num === 0 || num === 24 ? 12 + 'am' : num === 12 ? 12 + 'pm' : num < 12 ? num % 12 + 'am' : num % 12 + 'pm';\n};",
"example": "getMeridiemSuffixOfInteger(0); // \"12am\"\ngetMeridiemSuffixOfInteger(11); // \"11am\"\ngetMeridiemSuffixOfInteger(13); // \"1pm\"\ngetMeridiemSuffixOfInteger(25); // \"1pm\"" "example": "getMeridiemSuffixOfInteger(0); // \"12am\"\ngetMeridiemSuffixOfInteger(11); // \"11am\"\ngetMeridiemSuffixOfInteger(13); // \"1pm\"\ngetMeridiemSuffixOfInteger(25); // \"1pm\""
}, },
@ -2320,7 +2320,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "9e39c6a3a8ec5b51c5e16f69107fc9e90b2697b2cf2689850872071bb968723e" "hash": "16c3b724b653dcb31f3e59f1664a59951abb15a93eb3697cade4d3ae0e63c532"
} }
}, },
{ {
@ -3884,7 +3884,7 @@
"fileName": "join.md", "fileName": "join.md",
"text": "Joins all elements of an array into a string and returns this string.\nUses a separator and an end separator.\n\nUse `Array.prototype.reduce()` to combine elements into a string.\nOmit the second argument, `separator`, to use a default separator of `','`.\nOmit the third argument, `end`, to use the same value as `separator` by default.\n\n", "text": "Joins all elements of an array into a string and returns this string.\nUses a separator and an end separator.\n\nUse `Array.prototype.reduce()` to combine elements into a string.\nOmit the second argument, `separator`, to use a default separator of `','`.\nOmit the third argument, `end`, to use the same value as `separator` by default.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const join = (arr, separator = ',', end = separator) =>\n arr.reduce(\n (acc, val, i) =>\n i === arr.length - 2\n ? acc + val + end\n : i === arr.length - 1\n ? acc + val\n : acc + val + separator,\n ''\n );", "es6": "const join = (arr, separator = ',', end = separator) =>\n arr.reduce(\n (acc, val, i) =>\n i === arr.length - 2\n ? acc + val + end\n : i === arr.length - 1\n ? acc + val\n : acc + val + separator,\n ''\n );",
"es5": "var join = function join(arr) {\n var separator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : separator;\n return arr.reduce(function (acc, val, i) {\n return i === arr.length - 2 ? acc + val + end : i === arr.length - 1 ? acc + val : acc + val + separator;\n }, '');\n};", "es5": "var join = function join(arr) {\n var separator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : separator;\n return arr.reduce(function (acc, val, i) {\n return i === arr.length - 2 ? acc + val + end : i === arr.length - 1 ? acc + val : acc + val + separator;\n }, '');\n};",
"example": "join(['pen', 'pineapple', 'apple', 'pen'], ',', '&'); // \"pen,pineapple,apple&pen\"\njoin(['pen', 'pineapple', 'apple', 'pen'], ','); // \"pen,pineapple,apple,pen\"\njoin(['pen', 'pineapple', 'apple', 'pen']); // \"pen,pineapple,apple,pen\"" "example": "join(['pen', 'pineapple', 'apple', 'pen'], ',', '&'); // \"pen,pineapple,apple&pen\"\njoin(['pen', 'pineapple', 'apple', 'pen'], ','); // \"pen,pineapple,apple,pen\"\njoin(['pen', 'pineapple', 'apple', 'pen']); // \"pen,pineapple,apple,pen\""
}, },
@ -3894,7 +3894,7 @@
] ]
}, },
"meta": { "meta": {
"hash": "3db3faac666ee61ab86c70766d2ab5d1293ffd818da87edb971bfff7a366364a" "hash": "362fddaa6244404741e84bca6fc442a101fdb642af53b299e8b9994d0d7162d8"
} }
}, },
{ {

1
snippets/checkProp.md
View File

@ -30,6 +30,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
const lengthIs4 = checkProp(l => l === 4, 'length'); const lengthIs4 = checkProp(l => l === 4, 'length');
lengthIs4([]); // false lengthIs4([]); // false
lengthIs4([1,2,3,4]); // true lengthIs4([1,2,3,4]); // true

5
snippets/deepClone.md
View File

@ -11,6 +11,7 @@ Use `Object.assign()` and an empty object (`{}`) to create a shallow clone of th
Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned. Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.
```js ```js
const deepClone = obj => { const deepClone = obj => {
if (obj === null) return null; if (obj === null) return null;
let clone = Object.assign({}, obj); let clone = Object.assign({}, obj);
@ -20,8 +21,8 @@ const deepClone = obj => {
return Array.isArray(obj) && obj.length return Array.isArray(obj) && obj.length
? (clone.length = obj.length) && Array.from(clone) ? (clone.length = obj.length) && Array.from(clone)
: Array.isArray(obj) : Array.isArray(obj)
? Array.from(obj) ? Array.from(obj)
: clone; : clone;
}; };
``` ```

5
snippets/deepMapKeys.md
View File

@ -10,17 +10,18 @@ Use `Object.keys(obj)` to iterate over the object's keys.
Use `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`. Use `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.
```js ```js
const deepMapKeys = (obj, f) => const deepMapKeys = (obj, f) =>
Array.isArray(obj) Array.isArray(obj)
? obj.map(val => deepMapKeys(val, f)) ? obj.map(val => deepMapKeys(val, f))
: typeof obj === 'object' : typeof obj === 'object'
? Object.keys(obj).reduce((acc, current) => { ? Object.keys(obj).reduce((acc, current) => {
const val = obj[current]; const val = obj[current];
acc[f(current)] = acc[f(current)] =
val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val); val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);
return acc; return acc;
}, {}) }, {})
: obj; : obj;
``` ```
```js ```js

7
snippets/dig.md
View File

@ -9,13 +9,14 @@ Use the `in` operator to check if `target` exists in `obj`.
If found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found. If found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.
```js ```js
const dig = (obj, target) => const dig = (obj, target) =>
target in obj target in obj
? obj[target] ? obj[target]
: Object.values(obj).reduce((acc, val) => { : Object.values(obj).reduce((acc, val) => {
if (acc !== undefined) return acc; if (acc !== undefined) return acc;
if (typeof val === 'object') return dig(val, target); if (typeof val === 'object') return dig(val, target);
}, undefined); }, undefined);
``` ```
```js ```js

9
snippets/factorial.md
View File

@ -11,14 +11,15 @@ Otherwise, return the product of `n` and the factorial of `n - 1`.
Throws an exception if `n` is a negative number. Throws an exception if `n` is a negative number.
```js ```js
const factorial = n => const factorial = n =>
n < 0 n < 0
? (() => { ? (() => {
throw new TypeError('Negative numbers are not allowed!'); throw new TypeError('Negative numbers are not allowed!');
})() })()
: n <= 1 : n <= 1
? 1 ? 1
: n * factorial(n - 1); : n * factorial(n - 1);
``` ```
```js ```js

9
snippets/getMeridiemSuffixOfInteger.md
View File

@ -8,14 +8,15 @@ Converts an integer to a suffixed string, adding `am` or `pm` based on its value
Use the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix. Use the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.
```js ```js
const getMeridiemSuffixOfInteger = num => const getMeridiemSuffixOfInteger = num =>
num === 0 || num === 24 num === 0 || num === 24
? 12 + 'am' ? 12 + 'am'
: num === 12 : num === 12
? 12 + 'pm' ? 12 + 'pm'
: num < 12 : num < 12
? (num % 12) + 'am' ? (num % 12) + 'am'
: (num % 12) + 'pm'; : (num % 12) + 'pm';
``` ```
```js ```js

5
snippets/join.md
View File

@ -11,14 +11,15 @@ Omit the second argument, `separator`, to use a default separator of `','`.
Omit the third argument, `end`, to use the same value as `separator` by default. Omit the third argument, `end`, to use the same value as `separator` by default.
```js ```js
const join = (arr, separator = ',', end = separator) => const join = (arr, separator = ',', end = separator) =>
arr.reduce( arr.reduce(
(acc, val, i) => (acc, val, i) =>
i === arr.length - 2 i === arr.length - 2
? acc + val + end ? acc + val + end
: i === arr.length - 1 : i === arr.length - 1
? acc + val ? acc + val
: acc + val + separator, : acc + val + separator,
'' ''
); );
``` ```

34
test/_30s.js
View File

@ -199,8 +199,8 @@ const deepClone = obj => {
return Array.isArray(obj) && obj.length return Array.isArray(obj) && obj.length
? (clone.length = obj.length) && Array.from(clone) ? (clone.length = obj.length) && Array.from(clone)
: Array.isArray(obj) : Array.isArray(obj)
? Array.from(obj) ? Array.from(obj)
: clone; : clone;
}; };
const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v))); const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));
const deepFreeze = obj => const deepFreeze = obj =>
@ -212,13 +212,13 @@ const deepMapKeys = (obj, f) =>
Array.isArray(obj) Array.isArray(obj)
? obj.map(val => deepMapKeys(val, f)) ? obj.map(val => deepMapKeys(val, f))
: typeof obj === 'object' : typeof obj === 'object'
? Object.keys(obj).reduce((acc, current) => { ? Object.keys(obj).reduce((acc, current) => {
const val = obj[current]; const val = obj[current];
acc[f(current)] = acc[f(current)] =
val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val); val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);
return acc; return acc;
}, {}) }, {})
: obj; : obj;
const defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj); const defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);
const defer = (fn, ...args) => setTimeout(fn, 1, ...args); const defer = (fn, ...args) => setTimeout(fn, 1, ...args);
const degreesToRads = deg => (deg * Math.PI) / 180.0; const degreesToRads = deg => (deg * Math.PI) / 180.0;
@ -240,9 +240,9 @@ const dig = (obj, target) =>
target in obj target in obj
? obj[target] ? obj[target]
: Object.values(obj).reduce((acc, val) => { : Object.values(obj).reduce((acc, val) => {
if (acc !== undefined) return acc; if (acc !== undefined) return acc;
if (typeof val === 'object') return dig(val, target); if (typeof val === 'object') return dig(val, target);
}, undefined); }, undefined);
const digitize = n => [...`${n}`].map(i => parseInt(i)); const digitize = n => [...`${n}`].map(i => parseInt(i));
const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0); const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);
const drop = (arr, n = 1) => arr.slice(n); const drop = (arr, n = 1) => arr.slice(n);
@ -315,11 +315,11 @@ const extendHex = shortHex =>
const factorial = n => const factorial = n =>
n < 0 n < 0
? (() => { ? (() => {
throw new TypeError('Negative numbers are not allowed!'); throw new TypeError('Negative numbers are not allowed!');
})() })()
: n <= 1 : n <= 1
? 1 ? 1
: n * factorial(n - 1); : n * factorial(n - 1);
const fibonacci = n => const fibonacci = n =>
Array.from({ length: n }).reduce( Array.from({ length: n }).reduce(
(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i), (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
@ -420,10 +420,10 @@ const getMeridiemSuffixOfInteger = num =>
num === 0 || num === 24 num === 0 || num === 24
? 12 + 'am' ? 12 + 'am'
: num === 12 : num === 12
? 12 + 'pm' ? 12 + 'pm'
: num < 12 : num < 12
? (num % 12) + 'am' ? (num % 12) + 'am'
: (num % 12) + 'pm'; : (num % 12) + 'pm';
const getScrollPosition = (el = window) => ({ const getScrollPosition = (el = window) => ({
x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft, x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
@ -645,8 +645,8 @@ const join = (arr, separator = ',', end = separator) =>
i === arr.length - 2 i === arr.length - 2
? acc + val + end ? acc + val + end
: i === arr.length - 1 : i === arr.length - 1
? acc + val ? acc + val
: acc + val + separator, : acc + val + separator,
'' ''
); );
const JSONtoCSV = (arr, columns, delimiter = ',') => const JSONtoCSV = (arr, columns, delimiter = ',') =>

37
vscode_snippets/snippets.json
View File

@ -504,6 +504,7 @@
"prefix": "30s_deepClone", "prefix": "30s_deepClone",
"body": [ "body": [
"const deepClone = obj => {", "const deepClone = obj => {",
" if (obj === null) return null;",
" let clone = Object.assign({}, obj);", " let clone = Object.assign({}, obj);",
" Object.keys(clone).forEach(", " Object.keys(clone).forEach(",
" key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])", " key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])",
@ -511,11 +512,11 @@
" return Array.isArray(obj) && obj.length", " return Array.isArray(obj) && obj.length",
" ? (clone.length = obj.length) && Array.from(clone)", " ? (clone.length = obj.length) && Array.from(clone)",
" : Array.isArray(obj)", " : Array.isArray(obj)",
" ? Array.from(obj)", " ? Array.from(obj)",
" : clone;", " : clone;",
"};" "};"
], ],
"description": "Creates a deep clone of an object.\n\nUse recursion.\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.\n" "description": "Creates a deep clone of an object.\n\nUse recursion.\nCheck if the passed object is `null` and, if so, return `null`.\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.\n"
}, },
"deepFlatten": { "deepFlatten": {
"prefix": "30s_deepFlatten", "prefix": "30s_deepFlatten",
@ -548,13 +549,13 @@
" Array.isArray(obj)", " Array.isArray(obj)",
" ? obj.map(val => deepMapKeys(val, f))", " ? obj.map(val => deepMapKeys(val, f))",
" : typeof obj === 'object'", " : typeof obj === 'object'",
" ? Object.keys(obj).reduce((acc, current) => {", " ? Object.keys(obj).reduce((acc, current) => {",
" const val = obj[current];", " const val = obj[current];",
" acc[f(current)] =", " acc[f(current)] =",
" val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);", " val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);",
" return acc;", " return acc;",
" }, {})", " }, {})",
" : obj;" " : obj;"
], ],
"description": "Deep maps an object's keys.\n\nCreates an object with the same values as the provided object and keys generated by running the provided function for each key.\nUse `Object.keys(obj)` to iterate over the object's keys. \nUse `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.\n" "description": "Deep maps an object's keys.\n\nCreates an object with the same values as the provided object and keys generated by running the provided function for each key.\nUse `Object.keys(obj)` to iterate over the object's keys. \nUse `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.\n"
}, },
@ -630,9 +631,9 @@
" target in obj", " target in obj",
" ? obj[target]", " ? obj[target]",
" : Object.values(obj).reduce((acc, val) => {", " : Object.values(obj).reduce((acc, val) => {",
" if (acc !== undefined) return acc;", " if (acc !== undefined) return acc;",
" if (typeof val === 'object') return dig(val, target);", " if (typeof val === 'object') return dig(val, target);",
" }, undefined);" " }, undefined);"
], ],
"description": "Returns the target value in a nested JSON object, based on the given key.\n\nUse the `in` operator to check if `target` exists in `obj`.\nIf found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.\n" "description": "Returns the target value in a nested JSON object, based on the given key.\n\nUse the `in` operator to check if `target` exists in `obj`.\nIf found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.\n"
}, },
@ -795,11 +796,11 @@
"const factorial = n =>", "const factorial = n =>",
" n < 0", " n < 0",
" ? (() => {", " ? (() => {",
" throw new TypeError('Negative numbers are not allowed!');", " throw new TypeError('Negative numbers are not allowed!');",
" })()", " })()",
" : n <= 1", " : n <= 1",
" ? 1", " ? 1",
" : n * factorial(n - 1);" " : n * factorial(n - 1);"
], ],
"description": "Calculates the factorial of a number.\n\nUse recursion.\nIf `n` is less than or equal to `1`, return `1`.\nOtherwise, return the product of `n` and the factorial of `n - 1`.\nThrows an exception if `n` is a negative number.\n" "description": "Calculates the factorial of a number.\n\nUse recursion.\nIf `n` is less than or equal to `1`, return `1`.\nOtherwise, return the product of `n` and the factorial of `n - 1`.\nThrows an exception if `n` is a negative number.\n"
}, },
@ -1056,10 +1057,10 @@
" num === 0 || num === 24", " num === 0 || num === 24",
" ? 12 + 'am'", " ? 12 + 'am'",
" : num === 12", " : num === 12",
" ? 12 + 'pm'", " ? 12 + 'pm'",
" : num < 12", " : num < 12",
" ? (num % 12) + 'am'", " ? (num % 12) + 'am'",
" : (num % 12) + 'pm';" " : (num % 12) + 'pm';"
], ],
"description": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\n\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.\n" "description": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\n\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.\n"
}, },
@ -1713,8 +1714,8 @@
" i === arr.length - 2", " i === arr.length - 2",
" ? acc + val + end", " ? acc + val + end",
" : i === arr.length - 1", " : i === arr.length - 1",
" ? acc + val", " ? acc + val",
" : acc + val + separator,", " : acc + val + separator,",
" ''", " ''",
" );" " );"
], ],