split-at 
Split a string at one or more indices
Install
$ npm install split-at
Usage
const splitAt = require('split-at');
splitAt('unicorn', 2);
splitAt('unicorn', -2);
splitAt('unicorn&rainbow', [6, 7]);
splitAt('unicorn&rainbow', 7, {remove: true});
API
splitAt(string, index, [options])
string
Type: string
String to be split.
index
Type: number | number[]
One or more indices. A negative index is a 1-based position from the end of the string. For example, -1 is the index of the last place in the string. Duplicate indices are removed from the index
array. A negative index and positive index that refer to the same position in the string are treated as duplicates.
options
Type: object
remove
Type: boolean
Default: false
Remove the chosen indices.
Similar to the default String#split
behaviour.
Related
- split-on-first - Split a string on the first occurrence of a given separator
License
MIT © Sindre Sorhus