andre/30-seconds-of-code
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Simplify indexOfAll

Browse Source
This commit is contained in:
Siarhei
2018-08-02 15:36:36 +04:00
parent 485847fa5d
commit e8080f45d7
2 changed files with 3 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
snippets/indexOfAll.md
View File

@ -2,15 +2,11 @@
Returns all indices of `val` in an array. If `val` never occurs, returns `[]`. Returns all indices of `val` in an array. If `val` never occurs, returns `[]`.
Use `Array.forEach()` to loop over elements and `Array.push()` to store indices for matching elements. Use `Array.reduce()` to loop over elements and store indices for matching elements.
Return the array of indices. Return the array of indices.
```js ```js
const indexOfAll = (arr, val) => { const indexOfAll = (arr, val) => (arr, val) => arr.reduce((acc, el, i) => el === val ? [...acc, i] : acc, []);
const indices = [];
arr.forEach((el, i) => el === val && indices.push(i));
return indices;
};
``` ```
```js ```js

6
test/indexOfAll/indexOfAll.js
View File

@ -1,6 +1,2 @@
const indexOfAll = (arr, val) => { const indexOfAll = (arr, val) => arr.reduce((acc, el, i) => el === val ? [...acc, i] : acc, []);
const indices = [];
arr.forEach((el, i) => el === val && indices.push(i));
return indices;
};
module.exports = indexOfAll; module.exports = indexOfAll;