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Remove filterFalsy

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This commit is contained in:
Angelos Chalaris
2020-03-10 22:00:47 +02:00
parent edd87e14c7
commit 9dd28f1486
2 changed files with 0 additions and 33 deletions
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16
snippets/filterFalsy.md
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---
title: filterFalsy
tags: array,beginner
---
Filters out the falsy values in an array.
Use `Array.prototype.filter()` to get an array containing only truthy values.
```js
const filterFalsy = arr => arr.filter(Boolean);
```
```js
filterFalsy(['', true, {}, false, 'sample', 1, 0]); // [true, {}, 'sample', 1]
```

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test/filterFalsy.test.js
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const { filterFalsy } = require('./_30s.js');
test('filterFalsy is a Function', () => {
expect(filterFalsy).toBeInstanceOf(Function);
});
test('filterFalsy filters different types of falsy values', () => {
expect(filterFalsy(['', true, {}, false, 'sample', 1, 0])).toEqual([true, {}, 'sample', 1]);
});
test('filterFalsy returns an empty array if you pass it an array of falsy values', () => {
expect(filterFalsy(['', 0, false, '', false, 0])).toEqual([]);
});
test('filterFalsy returns all of the truthy elements in an array', () => {
expect(filterFalsy([true, null, 'test', {}, []])).toEqual([true, 'test', {}, []]);
});