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30secondsofcode
2020-03-17 14:05:53 +00:00
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24
snippet_data/snippetList.json
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"text": "Deep freezes an object.\n\nUse `Object.keys()` to get all the properties of the passed object, `Array.prototype.forEach()` to iterate over them.\nCall `Object.freeze(obj)` recursively on all properties, checking if each one is frozen using `Object.isFrozen()` and applying `deepFreeze()` as necessary.\nFinally, use `Object.freeze()` to freeze the given object.\n\n",
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72
snippet_data/snippets.json
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"text": "Deep freezes an object.\n\nCalls `Object.freeze(obj)` recursively on all unfrozen properties of passed object that are `instanceof` object.\n\n",
"text": "Deep freezes an object.\n\nUse `Object.keys()` to get all the properties of the passed object, `Array.prototype.forEach()` to iterate over them.\nCall `Object.freeze(obj)` recursively on all properties, checking if each one is frozen using `Object.isFrozen()` and applying `deepFreeze()` as necessary.\nFinally, use `Object.freeze()` to freeze the given object.\n\n",
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"es5": "var deepFreeze = function deepFreeze(obj) {\n return Object.keys(obj).forEach(function (prop) {\n return !(obj[prop] instanceof Object) || Object.isFrozen(obj[prop]) ? null : deepFreeze(obj[prop]);\n }) || Object.freeze(obj);\n};",
"es6": "const deepFreeze = obj => {\n Object.keys(obj).forEach(\n prop =>\n (obj[prop] =\n typeof obj[prop] === 'object' && !Object.isFrozen(obj[prop])\n ? deepFreeze(obj[prop])\n : obj[prop])\n );\n return Object.freeze(obj);\n};",
"es5": "function _typeof(obj) { \"@babel/helpers - typeof\"; 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 deepFreeze = function deepFreeze(obj) {\n Object.keys(obj).forEach(function (prop) {\n return obj[prop] = _typeof(obj[prop]) === 'object' && !Object.isFrozen(obj[prop]) ? deepFreeze(obj[prop]) : obj[prop];\n });\n return Object.freeze(obj);\n};",
"example": "'use strict';\n\nconst o = deepFreeze([1, [2, 3]]);\n\no[0] = 3; // not allowed\no[1][0] = 4; // not allowed as well"
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1
snippets/deepClone.md
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@ -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);

10
snippets/deepFreeze.md
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@ -11,11 +11,15 @@ Finally, use `Object.freeze()` to freeze the given object.
```js
const deepFreeze = obj => {
Object.keys(obj).forEach(prop =>
obj[prop] = typeof obj[prop] === 'object' && !Object.isFrozen(obj[prop]) ? deepFreeze(obj[prop]) : obj[prop]
Object.keys(obj).forEach(
prop =>
(obj[prop] =
typeof obj[prop] === 'object' && !Object.isFrozen(obj[prop])
? deepFreeze(obj[prop])
: obj[prop])
);
return Object.freeze(obj);
}
};
```
```js

1
snippets/dig.md
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@ -9,7 +9,6 @@ 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
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@ -11,7 +11,6 @@ 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
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@ -8,7 +8,6 @@ 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'

1
snippets/join.md
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@ -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) =>

1
snippets/objectToQueryString.md
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@ -10,6 +10,7 @@ Determine the `symbol` to be either `?` or `&` based on the `length` of `querySt
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) => {

1
snippets/pipeAsyncFunctions.md
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@ -14,6 +14,7 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
```
```js
const sum = pipeAsyncFunctions(
x => x + 1,
x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),

1
snippets/remove.md
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@ -9,7 +9,6 @@ Use `Array.prototype.filter()` to find array elements that return truthy values
The `func` is invoked with three arguments (`value, index, array`).
```js
const remove = (arr, func) =>
Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => {

1
snippets/size.md
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@ -12,7 +12,6 @@ Use `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API
Split strings into array of characters with `split('')` and return its length.
```js
const size = val =>
Array.isArray(val)
? val.length