insertAt<T>(      index,      values: T[],      array: T[]): void

At index, values are inserted in array.
index can be negative or positive. If positive, existing items beginning at that index
will be pushed to the right to make room. If negative, existing items ending at that
index will be pushed to the left to make room. No items get removed.

Examples

let arr = [1,2,3,4];   
insertAt(2, [7, 8], arr);  
// arr is now [1,2,7,8,3,4]

let arr = [1,2,3,4];   
insertAt(-1, [7, 8], arr);  
// arr is now [1,2,3,4,7,8]

let arr = [1,2,3,4];   
insertAt(-4, [7, 8], arr);  
// arr is now [1,7,8,2,3,4]

Installation

npm i @writetome51/array-insert-at

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import { insertAt } from '@writetome51/array-insert-at';