25 lines
616 B
Markdown
25 lines
616 B
Markdown
---
|
|
title: Array intersection based on function
|
|
type: snippet
|
|
tags: [array]
|
|
cover: digital-nomad-2
|
|
dateModified: 2020-10-20T23:02:01+03:00
|
|
---
|
|
|
|
Returns the elements that exist in both arrays, using a provided comparator function.
|
|
|
|
- Use `Array.prototype.filter()` and `Array.prototype.findIndex()` in combination with the provided comparator to determine intersecting values.
|
|
|
|
```js
|
|
const intersectionWith = (a, b, comp) =>
|
|
a.filter(x => b.findIndex(y => comp(x, y)) !== -1);
|
|
```
|
|
|
|
```js
|
|
intersectionWith(
|
|
[1, 1.2, 1.5, 3, 0],
|
|
[1.9, 3, 0, 3.9],
|
|
(a, b) => Math.round(a) === Math.round(b)
|
|
); // [1.5, 3, 0]
|
|
```
|