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30secondsofcode
2019-10-18 06:34:35 +00:00
parent 21299045b8
commit cb26e0ba49
14 changed files with 159 additions and 152 deletions
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39
README.md
View File

@ -7120,17 +7120,19 @@ get(obj, 'selector.to.val', 'target[0]', 'target[2].a'); // ['val to select', 1,
Returns `true` if the target value exists in a JSON object, `false` otherwise.
Check if the key contains `.`, use `String.prototype.split('.')[0]` to get the first part and store as `_key`.
Use `typeof` to check if the contents of `obj[key]` are an `object` and, if so, call `hasKey` with that object and the remainder of the `key`.
Otherwise, use `Object.keys(obj)` in combination with `Array.prototype.includes()` to check if the given `key` exists.
Check if `keys` is non-empty and use `Array.prototype.every()` to sequentially check its keys to internal depth of the object, `obj`.
Use `Object.prototype.hasOwnProperty()` to check if `obj` does not have the current key or is not an object, stop propagation and return `false`.
Otherwise assign the key's value to `obj` to use on the next iteration.
Return `false` beforehand if given key list is empty.
```js
const hasKey = (obj, key) => {
if (key.includes('.')) {
let _key = key.split('.')[0];
if (typeof obj[_key] === 'object') return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));
}
return Object.keys(obj).includes(key);
const hasKey = (obj, keys) => {
return (keys.length > 0) && keys.every(key => {
if (typeof obj !== 'object' || !obj.hasOwnProperty(key)) return false;
obj = obj[key];
return true;
});
};
```
@ -7141,14 +7143,15 @@ const hasKey = (obj, key) => {
let obj = {
a: 1,
b: { c: 4 },
'd.e': 5
'b.d': 5
};
hasKey(obj, 'a'); // true
hasKey(obj, 'b'); // true
hasKey(obj, 'b.c'); // true
hasKey(obj, 'd.e'); // true
hasKey(obj, 'd'); // false
hasKey(obj, 'f'); // false
hasKey(obj, ['a']); // true
hasKey(obj, ['b']); // true
hasKey(obj, ['b', 'c']); // true
hasKey(obj, ['b.d']); // true
hasKey(obj, ['d']); // false
hasKey(obj, ['c']); // false
hasKey(obj, ['b', 'f']); // false
```
</details>
@ -9381,7 +9384,7 @@ const objectToQueryString = queryParameters => {
return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = index === 0 ? '?' : '&';
queryString += (typeof val === 'string') ? `${symbol}${key}=${val}` : '';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString;
}, '')
: '';
@ -9392,7 +9395,7 @@ const objectToQueryString = queryParameters => {
<summary>Examples</summary>
```js
objectToQueryString({page: '1', size: '2kg', key: undefined}); // '?page=1&size=2kg'
objectToQueryString({ page: '1', size: '2kg', key: undefined }); // '?page=1&size=2kg'
```
</details>

21
snippet_data/snippetList.json
View File

@ -412,7 +412,7 @@
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@ -835,7 +835,7 @@
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@ -898,7 +898,7 @@
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@ -1037,7 +1037,7 @@
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@ -1273,7 +1273,7 @@
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@ -1678,7 +1678,7 @@
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{
@ -1847,15 +1847,14 @@
"type": "snippetListing",
"title": "hasKey",
"attributes": {
"text": "Returns `true` if the target value exists in a JSON object, `false` otherwise.\n\nCheck if the key contains `.`, use `String.prototype.split('.')[0]` to get the first part and store as `_key`.\nUse `typeof` to check if the contents of `obj[key]` are an `object` and, if so, call `hasKey` with that object and the remainder of the `key`.\nOtherwise, use `Object.keys(obj)` in combination with `Array.prototype.includes()` to check if the given `key` exists.\n\n",
"text": "Returns `true` if the target value exists in a JSON object, `false` otherwise.\n\nCheck if `keys` is non-empty and use `Array.prototype.every()` to sequentially check its keys to internal depth of the object, `obj`. \nUse `Object.prototype.hasOwnProperty()` to check if `obj` does not have the current key or is not an object, stop propagation and return `false`.\nOtherwise assign the key's value to `obj` to use on the next iteration.\n\nReturn `false` beforehand if given key list is empty.\n\n",
"tags": [
"object",
"recursion",
"intermediate"
]
},
"meta": {
"hash": "a34ac55719f935ad7a3a9a48291bb54cba6ee2c62713137b94f25ac065a78dbc"
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{
@ -2836,7 +2835,7 @@
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@ -3397,7 +3396,7 @@
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}
},
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31
snippet_data/snippets.json
View File

@ -568,7 +568,7 @@
]
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@ -1153,7 +1153,7 @@
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@ -1240,7 +1240,7 @@
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@ -1433,7 +1433,7 @@
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"hash": "5f38360819f9225b887a94221bfee1a80f1bcc224a364440b3388f60491b03ba"
}
},
{
@ -1759,7 +1759,7 @@
]
},
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"hash": "55b1ce0a892110d792a9487e40331774015525479faa2b8961f6c2ea6291c27b"
}
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{
@ -2320,7 +2320,7 @@
]
},
"meta": {
"hash": "9e39c6a3a8ec5b51c5e16f69107fc9e90b2697b2cf2689850872071bb968723e"
"hash": "16c3b724b653dcb31f3e59f1664a59951abb15a93eb3697cade4d3ae0e63c532"
}
},
{
@ -2550,20 +2550,19 @@
"type": "snippet",
"attributes": {
"fileName": "hasKey.md",
"text": "Returns `true` if the target value exists in a JSON object, `false` otherwise.\n\nCheck if the key contains `.`, use `String.prototype.split('.')[0]` to get the first part and store as `_key`.\nUse `typeof` to check if the contents of `obj[key]` are an `object` and, if so, call `hasKey` with that object and the remainder of the `key`.\nOtherwise, use `Object.keys(obj)` in combination with `Array.prototype.includes()` to check if the given `key` exists.\n\n",
"text": "Returns `true` if the target value exists in a JSON object, `false` otherwise.\n\nCheck if `keys` is non-empty and use `Array.prototype.every()` to sequentially check its keys to internal depth of the object, `obj`. \nUse `Object.prototype.hasOwnProperty()` to check if `obj` does not have the current key or is not an object, stop propagation and return `false`.\nOtherwise assign the key's value to `obj` to use on the next iteration.\n\nReturn `false` beforehand if given key list is empty.\n\n",
"codeBlocks": {
"es6": "const hasKey = (obj, key) => {\n if (key.includes('.')) {\n let _key = key.split('.')[0];\n if (typeof obj[_key] === 'object') return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));\n }\n return Object.keys(obj).includes(key);\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 hasKey = function hasKey(obj, key) {\n if (key.includes('.')) {\n var _key = key.split('.')[0];\n if (_typeof(obj[_key]) === 'object') return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));\n }\n\n return Object.keys(obj).includes(key);\n};",
"example": "let obj = {\n a: 1,\n b: { c: 4 },\n 'd.e': 5\n};\nhasKey(obj, 'a'); // true\nhasKey(obj, 'b'); // true\nhasKey(obj, 'b.c'); // true\nhasKey(obj, 'd.e'); // true\nhasKey(obj, 'd'); // false\nhasKey(obj, 'f'); // false"
"es6": "const hasKey = (obj, keys) => {\n return (keys.length > 0) && keys.every(key => {\n if (typeof obj !== 'object' || !obj.hasOwnProperty(key)) return false;\n obj = obj[key];\n return true;\n });\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 hasKey = function hasKey(obj, keys) {\n return keys.length > 0 && keys.every(function (key) {\n if (_typeof(obj) !== 'object' || !obj.hasOwnProperty(key)) return false;\n obj = obj[key];\n return true;\n });\n};",
"example": "let obj = {\n a: 1,\n b: { c: 4 },\n 'b.d': 5\n};\nhasKey(obj, ['a']); // true\nhasKey(obj, ['b']); // true\nhasKey(obj, ['b', 'c']); // true\nhasKey(obj, ['b.d']); // true\nhasKey(obj, ['d']); // false\nhasKey(obj, ['c']); // false\nhasKey(obj, ['b', 'f']); // false"
},
"tags": [
"object",
"recursion",
"intermediate"
]
},
"meta": {
"hash": "a34ac55719f935ad7a3a9a48291bb54cba6ee2c62713137b94f25ac065a78dbc"
"hash": "d4a8563ed14c77123d07e9d3b206beea4a12bafdba9612c2afa04b3f87563b36"
}
},
{
@ -3916,7 +3915,7 @@
]
},
"meta": {
"hash": "3db3faac666ee61ab86c70766d2ab5d1293ffd818da87edb971bfff7a366364a"
"hash": "362fddaa6244404741e84bca6fc442a101fdb642af53b299e8b9994d0d7162d8"
}
},
{
@ -4675,9 +4674,9 @@
"fileName": "objectToQueryString.md",
"text": "Returns a query string generated from the key-value pairs of the given object.\n\nUse `Array.prototype.reduce()` on `Object.entries(queryParameters)` to create the query string.\nDetermine the `symbol` to be either `?` or `&` based on the `index` and concatenate `val` to `queryString` only if it's a string.\nReturn the `queryString` or an empty string when the `queryParameters` are falsy.\n\n",
"codeBlocks": {
"es6": "const objectToQueryString = queryParameters => {\n return queryParameters\n ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {\n const symbol = index === 0 ? '?' : '&';\n queryString += (typeof val === 'string') ? `${symbol}${key}=${val}` : '';\n return queryString;\n }, '')\n : '';\n};",
"es6": "const objectToQueryString = queryParameters => {\n return queryParameters\n ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {\n const symbol = index === 0 ? '?' : '&';\n queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';\n return queryString;\n }, '')\n : '';\n};",
"es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar objectToQueryString = function objectToQueryString(queryParameters) {\n return queryParameters ? Object.entries(queryParameters).reduce(function (queryString, _ref, index) {\n var _ref2 = _slicedToArray(_ref, 2),\n key = _ref2[0],\n val = _ref2[1];\n\n var symbol = index === 0 ? '?' : '&';\n queryString += typeof val === 'string' ? \"\".concat(symbol).concat(key, \"=\").concat(val) : '';\n return queryString;\n }, '') : '';\n};",
"example": "objectToQueryString({page: '1', size: '2kg', key: undefined}); // '?page=1&size=2kg'"
"example": "objectToQueryString({ page: '1', size: '2kg', key: undefined }); // '?page=1&size=2kg'"
},
"tags": [
"utility",
@ -4687,7 +4686,7 @@
]
},
"meta": {
"hash": "e87fc52b6d22804ebb9f4adb2acade44183b8db53d101839c6d5cb02aa32419b"
"hash": "012ebca6a90c50ec89278af2632d7d0d90eeb423f2bcf902ed015f6fce6d4f5a"
}
},
{

1
snippets/checkProp.md
View File

@ -34,6 +34,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop]);
const lengthIs4 = checkProp(l => l === 4, 'length');

1
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.
```js
const deepClone = obj => {
if (obj === null) return null;
let clone = Object.assign({}, obj);

1
snippets/deepMapKeys.md
View File

@ -10,6 +10,7 @@ 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`.
```js
const deepMapKeys = (obj, f) =>
Array.isArray(obj)
? obj.map(val => deepMapKeys(val, f))

1
snippets/dig.md
View File

@ -9,6 +9,7 @@ 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.
```js
const dig = (obj, target) =>
target in obj
? obj[target]

1
snippets/factorial.md
View File

@ -11,6 +11,7 @@ Otherwise, return the product of `n` and the factorial of `n - 1`.
Throws an exception if `n` is a negative number.
```js
const factorial = n =>
n < 0
? (() => {

1
snippets/getMeridiemSuffixOfInteger.md
View File

@ -8,6 +8,7 @@ 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.
```js
const getMeridiemSuffixOfInteger = num =>
num === 0 || num === 24
? 12 + 'am'

5
snippets/hasKey.md
View File

@ -12,8 +12,9 @@ Otherwise assign the key's value to `obj` to use on the next iteration.
Return `false` beforehand if given key list is empty.
```js
const hasKey = (obj, keys) => {
return (keys.length > 0) && keys.every((key) => {
return (keys.length > 0) && keys.every(key => {
if (typeof obj !== 'object' || !obj.hasOwnProperty(key)) return false;
obj = obj[key];
return true;
@ -25,7 +26,7 @@ const hasKey = (obj, keys) => {
let obj = {
a: 1,
b: { c: 4 },
'b.d': 5,
'b.d': 5
};
hasKey(obj, ['a']); // true
hasKey(obj, ['b']); // true

1
snippets/join.md
View File

@ -11,6 +11,7 @@ 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.
```js
const join = (arr, separator = ',', end = separator) =>
arr.reduce(
(acc, val, i) =>

6
snippets/objectToQueryString.md
View File

@ -10,12 +10,11 @@ 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.
```js
const objectToQueryString = queryParameters => {
return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = index === 0 ? '?' : '&';
queryString += (typeof val === 'string') ? `${symbol}${key}=${val}` : '';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString;
}, '')
: '';
@ -23,6 +22,5 @@ const objectToQueryString = queryParameters => {
```
```js
objectToQueryString({page: '1', size: '2kg', key: undefined}); // '?page=1&size=2kg'
objectToQueryString({ page: '1', size: '2kg', key: undefined }); // '?page=1&size=2kg'
```

14
test/_30s.js
View File

@ -466,12 +466,12 @@ const hashNode = val =>
0
)
);
const hasKey = (obj, key) => {
if (key.includes('.')) {
let _key = key.split('.')[0];
if (typeof obj[_key] === 'object') return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));
}
return Object.keys(obj).includes(key);
const hasKey = (obj, keys) => {
return (keys.length > 0) && keys.every(key => {
if (typeof obj !== 'object' || !obj.hasOwnProperty(key)) return false;
obj = obj[key];
return true;
});
};
const head = arr => arr[0];
const hexToRGB = hex => {
@ -772,7 +772,7 @@ const objectToQueryString = queryParameters => {
return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = index === 0 ? '?' : '&';
queryString += (typeof val === 'string') ? `${symbol}${key}=${val}` : '';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString;
}, '')
: '';

16
vscode_snippets/snippets.json
View File

@ -1169,15 +1169,15 @@
"hasKey": {
"prefix": "30s_hasKey",
"body": [
"const hasKey = (obj, key) => {",
" if (key.includes('.')) {",
" let _key = key.split('.')[0];",
" if (typeof obj[_key] === 'object') return hasKey(obj[_key], key.slice(key.indexOf('.') + 1));",
" }",
" return Object.keys(obj).includes(key);",
"const hasKey = (obj, keys) => {",
" return (keys.length > 0) && keys.every(key => {",
" if (typeof obj !== 'object' || !obj.hasOwnProperty(key)) return false;",
" obj = obj[key];",
" return true;",
" });",
"};"
],
"description": "Returns `true` if the target value exists in a JSON object, `false` otherwise.\n\nCheck if the key contains `.`, use `String.prototype.split('.')[0]` to get the first part and store as `_key`.\nUse `typeof` to check if the contents of `obj[key]` are an `object` and, if so, call `hasKey` with that object and the remainder of the `key`.\nOtherwise, use `Object.keys(obj)` in combination with `Array.prototype.includes()` to check if the given `key` exists.\n"
"description": "Returns `true` if the target value exists in a JSON object, `false` otherwise.\n\nCheck if `keys` is non-empty and use `Array.prototype.every()` to sequentially check its keys to internal depth of the object, `obj`. \nUse `Object.prototype.hasOwnProperty()` to check if `obj` does not have the current key or is not an object, stop propagation and return `false`.\nOtherwise assign the key's value to `obj` to use on the next iteration.\n\nReturn `false` beforehand if given key list is empty.\n"
},
"head": {
"prefix": "30s_head",
@ -2057,7 +2057,7 @@
" return queryParameters",
" ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {",
" const symbol = index === 0 ? '?' : '&';",
" queryString += (typeof val === 'string') ? `${symbol}${key}=${val}` : '';",
" queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';",
" return queryString;",
" }, '')",
" : '';",