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30secondsofcode
2020-04-16 20:21:43 +00:00
parent 9a493bbbb7
commit 44df63e008
12 changed files with 124 additions and 79 deletions
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35
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87
snippet_data/snippets.json
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"fileName": "vectorAngle.md",
"text": "Returns the angle (theta) between two vectors.\n\nUse `Array.prototype.reduce()`, `Math.pow()` and `Math.sqrt()` to calculate the magnitude of each vector and the scalar product of the two vectors.\nUse `Math.acos()` to calculate the arccos and get the theta value.\n\n\n",
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"es6": "const vectorAngle = (x, y) => {\n let mX = Math.sqrt(x.reduce((acc, n) => acc + Math.pow(n, 2), 0));\n let mY = Math.sqrt(y.reduce((acc, n) => acc + Math.pow(n, 2), 0));\n return Math.acos(x.reduce((acc, n, i) => acc + n * y[i], 0) / (mX * mY));\n};",
"es5": "var vectorAngle = function vectorAngle(x, y) {\n var mX = Math.sqrt(x.reduce(function (acc, n) {\n return acc + Math.pow(n, 2);\n }, 0));\n var mY = Math.sqrt(y.reduce(function (acc, n) {\n return acc + Math.pow(n, 2);\n }, 0));\n return Math.acos(x.reduce(function (acc, n, i) {\n return acc + n * y[i];\n }, 0) / (mX * mY));\n};",
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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) => {

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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@ -9,6 +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) => {

1
snippets/size.md
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@ -12,6 +12,7 @@ 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