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30secondsofcode
2020-03-17 14:10:51 +00:00
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commit 08984462ab
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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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"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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@ -11,7 +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.
```js
const deepClone = obj => {
if (obj === null) return null;
let clone = Object.assign({}, obj);

3
snippets/deepFreeze.md
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@ -12,8 +12,7 @@ Finally, use `Object.freeze()` to freeze the given object.
```js
const deepFreeze = obj => {
Object.keys(obj).forEach(prop => {
if (obj[prop] === 'object' && !Object.isFrozen(obj[prop]))
deepFreeze(v[prop]);
if (obj[prop] === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(v[prop]);
});
return Object.freeze(obj);
};

1
snippets/getMeridiemSuffixOfInteger.md
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@ -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'

1
snippets/join.md
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@ -11,7 +11,6 @@ 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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@ -10,7 +10,6 @@ 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) => {

3
snippets/pipeAsyncFunctions.md
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@ -14,14 +14,13 @@ 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)),
x => x + 3,
async x => (await x) + 4
);
(async() => {
(async () => {
console.log(await sum(5)); // 15 (after one second)
})();
```

1
snippets/remove.md
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@ -9,6 +9,7 @@ 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) => {