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Angelos Chalaris
2017-12-14 10:07:14 +02:00
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@ -56,7 +56,7 @@
* [Random integer in range](#random-integer-in-range)
* [Random number in range](#random-number-in-range)
* [Randomize order of array](#randomize-order-of-array)
* [Redirect to url](#redirect-to-url)
* [Redirect to URL](#redirect-to-url)
* [Reverse a string](#reverse-a-string)
* [RGB to hexadecimal](#rgb-to-hexadecimal)
* [Run promises in series](#run-promises-in-series)
@ -198,12 +198,13 @@ const chunk = (arr, size) =>
### Compact
Use `.filter()` to filter falsey values. For example false, null, 0, "", undefined, and NaN are falsey.
Use `Array.filter()` to filter out falsey values (`false`, `null`, `0`, `""`, `undefined`, and `NaN`).
```js
const compact = (arr) => arr.filter(v => v);
// compact([0, 1, false, 2, '', 3, 'a', 'e'*23, NaN, 's', 34]) -> [ 1, 2, 3, 'a', 's', 34 ]
```
### Count occurrences of a value in array
Use `Array.reduce()` to increment a counter each time you encounter the specific value inside the array.