array-insertAt 
Inserts an item at a specific position.
Returns a new array, where an item is inserted at a specific position. The original array will not be modified.
Install
$ npm install --save array-insertat
Usage
const insertAt = require('array-insertat')
insertAt([1, 2], 1, 3)
// => [1, 3, 2]API
insertAt(array, index, item)
Returns the modified array.
array
Type: array
The array to modify.
index
Type: index
Position where to modify the array.
item
Type: item
The item to add.
License
MIT © Emil Johansson