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30secondsofcode
2019-11-06 17:28:06 +00:00
parent c9dadc5450
commit 99cd824e03
16 changed files with 1646 additions and 493 deletions
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44
README.md
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@ -680,7 +680,7 @@ const sum = pipeAsyncFunctions(
x => x + 3, x => x + 3,
async x => (await x) + 4 async x => (await x) + 4
); );
(async () => { (async() => {
console.log(await sum(5)); // 15 (after one second) console.log(await sum(5)); // 15 (after one second)
})(); })();
``` ```
@ -1769,8 +1769,8 @@ 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,
'' ''
); );
``` ```
@ -4318,10 +4318,10 @@ 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>
@ -5533,11 +5533,11 @@ 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>
@ -6748,8 +6748,8 @@ 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;
}; };
``` ```
@ -6837,13 +6837,13 @@ 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>
@ -6914,9 +6914,9 @@ 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>
@ -9430,10 +9430,10 @@ Return the `queryString` or an empty string when the `queryParameters` are falsy
const objectToQueryString = queryParameters => { const objectToQueryString = queryParameters => {
return queryParameters return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => { ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = index === 0 ? '?' : '&'; const symbol = index === 0 ? '?' : '&';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : ''; queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString; return queryString;
}, '') }, '')
: ''; : '';
}; };
``` ```

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1
snippets/checkProp.md
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@ -37,6 +37,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
const lengthIs4 = checkProp(l => l === 4, 'length'); const lengthIs4 = checkProp(l => l === 4, 'length');

5
snippets/deepClone.md
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@ -11,7 +11,6 @@ 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);
@ -21,8 +20,8 @@ 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)
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? Array.from(obj) ? Array.from(obj)
: clone; : clone;
}; };
``` ```

5
snippets/deepMapKeys.md
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@ -10,18 +10,17 @@ 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
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@ -9,14 +9,13 @@ 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

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snippets/factorial.md
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@ -11,15 +11,14 @@ 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

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snippets/getMeridiemSuffixOfInteger.md
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@ -8,15 +8,14 @@ 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
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@ -11,15 +11,14 @@ 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,
'' ''
); );
``` ```

9
snippets/objectToQueryString.md
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@ -10,13 +10,14 @@ Determine the `symbol` to be either `?` or `&` based on the `index` and concaten
Return the `queryString` or an empty string when the `queryParameters` are falsy. Return the `queryString` or an empty string when the `queryParameters` are falsy.
```js ```js
const objectToQueryString = queryParameters => { const objectToQueryString = queryParameters => {
return queryParameters return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => { ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = index === 0 ? '?' : '&'; const symbol = index === 0 ? '?' : '&';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : ''; queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString; return queryString;
}, '') }, '')
: ''; : '';
}; };
``` ```

3
snippets/pipeAsyncFunctions.md
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@ -14,13 +14,14 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
``` ```
```js ```js
const sum = pipeAsyncFunctions( const sum = pipeAsyncFunctions(
x => x + 1, x => x + 1,
x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)), x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
x => x + 3, x => x + 3,
async x => (await x) + 4 async x => (await x) + 4
); );
(async () => { (async() => {
console.log(await sum(5)); // 15 (after one second) console.log(await sum(5)); // 15 (after one second)
})(); })();
``` ```

42
test/_30s.js
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@ -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);
@ -314,11 +314,11 @@ 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),
@ -419,10 +419,10 @@ 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
@ -656,8 +656,8 @@ 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 = ',') =>
@ -776,10 +776,10 @@ const objectToPairs = obj => Object.keys(obj).map(k => [k, obj[k]]);
const objectToQueryString = queryParameters => { const objectToQueryString = queryParameters => {
return queryParameters return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => { ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = index === 0 ? '?' : '&'; const symbol = index === 0 ? '?' : '&';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : ''; queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString; return queryString;
}, '') }, '')
: ''; : '';
}; };
const observeMutations = (element, callback, options) => { const observeMutations = (element, callback, options) => {

42
vscode_snippets/snippets.json
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@ -512,8 +512,8 @@
" 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.\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" "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"
@ -549,13 +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"
}, },
@ -631,9 +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 +795,11 @@
"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 +1056,10 @@
" 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"
}, },
@ -1743,8 +1743,8 @@
" 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,",
" ''", " ''",
" );" " );"
], ],
@ -2073,10 +2073,10 @@
"const objectToQueryString = queryParameters => {", "const objectToQueryString = queryParameters => {",
" return queryParameters", " return queryParameters",
" ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {", " ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {",
" const symbol = index === 0 ? '?' : '&';", " const symbol = index === 0 ? '?' : '&';",
" queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';", " queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';",
" return queryString;", " return queryString;",
" }, '')", " }, '')",
" : '';", " : '';",
"};" "};"
], ],