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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
snippet_data/archivedSnippets.json
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26
snippet_data/snippetList.json
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"title": "head", "title": "head",
"attributes": { "attributes": {
"text": "Returns the head of a list.\n\nUse `arr[0]` to return the first element of the passed array.\n\n", "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",
"tags": [ "tags": [
"array", "array",
"beginner" "beginner"
] ]
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"attributes": { "attributes": {
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"tags": [ "tags": [
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"beginner" "beginner"
] ]
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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. 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'

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. 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) =>

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)
})(); })();
``` ```

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`). The `func` is invoked with three arguments (`value, index, array`).
```js ```js
const remove = (arr, func) => const remove = (arr, func) =>
Array.isArray(arr) Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => { ? 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. Split strings into array of characters with `split('')` and return its length.
```js ```js
const size = val => const size = val =>
Array.isArray(val) Array.isArray(val)
? val.length ? 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 => { const hexToRGB = hex => {
let alpha = false, let alpha = false,
h = hex.slice(hex.startsWith('#') ? 1 : 0); h = hex.slice(hex.startsWith('#') ? 1 : 0);
@ -673,7 +673,7 @@ const JSONtoCSV = (arr, columns, delimiter = ',') =>
const JSONToFile = (obj, filename) => const JSONToFile = (obj, filename) =>
fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2)); fs.writeFile(`${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 lcm = (...arr) => {
const gcd = (x, y) => (!y ? x : gcd(y, x % y)); const gcd = (x, y) => (!y ? x : gcd(y, x % y));
const _lcm = (x, y) => (x * y) / gcd(x, y); const _lcm = (x, y) => (x * y) / gcd(x, y);

8
vscode_snippets/snippets.json
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@ -1185,9 +1185,9 @@
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"prefix": "30s_head", "prefix": "30s_head",
"body": [ "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": { "hexToRGB": {
"prefix": "30s_hexToRGB", "prefix": "30s_hexToRGB",
@ -1778,9 +1778,9 @@
"last": { "last": {
"prefix": "30s_last", "prefix": "30s_last",
"body": [ "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": { "lcm": {
"prefix": "30s_lcm", "prefix": "30s_lcm",