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30secondsofcode
2019-12-11 07:57:04 +00:00
parent 69ceac0e7d
commit 0229a854c9
14 changed files with 865 additions and 868 deletions
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100
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26
snippet_data/snippetList.json
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"text": "Returns the head of a list.\n\nCheck if `arr` is truthy and has a `length` property, use `arr[0]` if possible to return the first element, otherwise return `undefined`.\n\n",
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1456
snippet_data/snippets.json
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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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@ -11,7 +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) =>

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
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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@ -9,7 +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

4
test/_30s.js
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@ -476,7 +476,7 @@ const hasKey = (obj, keys) => {
})
);
};
const head = arr => arr[0];
const head = arr => (arr && arr.length ? arr[0] : undefined);
const hexToRGB = hex => {
let alpha = false,
h = hex.slice(hex.startsWith('#') ? 1 : 0);
@ -673,7 +673,7 @@ const JSONtoCSV = (arr, columns, delimiter = ',') =>
const JSONToFile = (obj, filename) =>
fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2));
const last = arr => arr[arr.length - 1];
const last = arr => (arr && arr.length ? arr[arr.length - 1] : undefined);
const lcm = (...arr) => {
const gcd = (x, y) => (!y ? x : gcd(y, x % y));
const _lcm = (x, y) => (x * y) / gcd(x, y);

8
vscode_snippets/snippets.json
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@ -1185,9 +1185,9 @@
"head": {
"prefix": "30s_head",
"body": [
"const head = arr => arr[0];"
"const head = arr => (arr && arr.length ? arr[0] : undefined);"
],
"description": "Returns the head of a list.\n\nUse `arr[0]` to return the first element of the passed array.\n"
"description": "Returns the head of a list.\n\nCheck if `arr` is truthy and has a `length` property, use `arr[0]` if possible to return the first element, otherwise return `undefined`.\n"
},
"hexToRGB": {
"prefix": "30s_hexToRGB",
@ -1778,9 +1778,9 @@
"last": {
"prefix": "30s_last",
"body": [
"const last = arr => arr[arr.length - 1];"
"const last = arr => (arr && arr.length ? arr[arr.length - 1] : undefined);"
],
"description": "Returns the last element in an array.\n\nUse `arr.length - 1` to compute the index of the last element of the given array and returning it.\n"
"description": "Returns the last element in an array.\n\nCheck if `arr` is truthy and has a `length` property, use `arr.length - 1` to compute the index of the last element of the given array and return it, otherwise return `undefined`.\n"
},
"lcm": {
"prefix": "30s_lcm",