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30secondsofcode
2020-04-16 20:16:20 +00:00
parent 72bd003b81
commit 5fbf193e3a
12 changed files with 86 additions and 91 deletions
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22
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"es5": "var pipeAsyncFunctions = function pipeAsyncFunctions() {\n for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n fns[_key] = arguments[_key];\n }\n\n return function (arg) {\n return fns.reduce(function (p, f) {\n return p.then(f);\n }, Promise.resolve(arg));\n };\n};",
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"fileName": "vectorDistance.md",
"text": "Returns the distance between two vectors.\n\nUse `Array.prototype.reduce()`, `Math.pow()` and `Math.sqrt()` to calculate the Euclidean distance between two vectors.\n\n",
"codeBlocks": {
"es6": "const vectorDistance = (...coords) => {\n let pointLength = Math.trunc(coords.length / 2);\n let sum = coords\n .slice(0, pointLength)\n .reduce((acc, val, i) => acc + Math.pow(val - coords[pointLength + i], 2), 0);\n return Math.sqrt(sum);\n};",
"es5": "var vectorDistance = function vectorDistance() {\n for (var _len = arguments.length, coords = new Array(_len), _key = 0; _key < _len; _key++) {\n coords[_key] = arguments[_key];\n }\n\n var pointLength = Math.trunc(coords.length / 2);\n var sum = coords.slice(0, pointLength).reduce(function (acc, val, i) {\n return acc + Math.pow(val - coords[pointLength + i], 2);\n }, 0);\n return Math.sqrt(sum);\n};",
"example": "vectorDistance(10, 0, 5, 20, 0, 10); // 11.180339887498949"
"es6": "const vectorDistance = (x, y) =>\n Math.sqrt(x.reduce((acc, val, i) => acc + Math.pow(val - y[i], 2), 0));",
"es5": "var vectorDistance = function vectorDistance(x, y) {\n return Math.sqrt(x.reduce(function (acc, val, i) {\n return acc + Math.pow(val - y[i], 2);\n }, 0));\n};",
"example": "vectorDistance([10, 0, 5], [20, 0, 10]); // 11.180339887498949"
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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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@ -9,7 +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