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Update differenceWith.md

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use Array.findIndex() instead of Array.find()
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Chao
2018-01-04 11:37:10 +08:00
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snippets/differenceWith.md
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@ -2,12 +2,12 @@
Filters out all values from an array for which the comparator function does not return `true`.
Use `Array.filter()` and `Array.find()` to find the appropriate values.
Use `Array.filter()` and `Array.findIndex()` to find the appropriate values.
```js
const differenceWith = (arr, val, comp) => arr.filter(a => !val.find(b => comp(a, b)));
const differenceWith = (arr, val, comp) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);
```
```js
differenceWith([1, 1.2, 1.5, 3], [1.9, 3], (a, b) => Math.round(a) == Math.round(b)); // [1, 1.2]
differenceWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b)); // [1, 1.2]
```