getAndRemoveAdjacentAt<T>(      startingIndex: number,      howMany: number,      array: T[]): T[]

Beginning at startingIndex, it removes and returns howMany adjacent items from array.
startingIndex can be positive or negative.
Intended as a replacement for Array.prototype.splice() when removing items from array.
This does strict validation for all 3 parameters.

Examples

let arr = [1,2,3,4,5,6];
getAndRemoveAdjacentAt(1, 3, arr);
// --> [2,3,4]
// arr is now [1,5,6]

arr = [1, 2, 3, 4, 5, 6, 7, 8];
getAndRemoveAdjacentAt(-4, 2, arr);
// --> [5,6]
// arr is now [1,2,3,4,7,8].

arr = [1, 2, 3, 4, 5, 6];
getAndRemoveAdjacentAt(-2, 3, arr); // requesting 1 too many items.
// Error: 'the array does not have enough items to fulfill your request'

getAndRemoveAdjacentAt(0, 1, []); // index 0 doesn't exist on empty array.
// Error: 'The entered index is not valid.  Whether positive or negative, 
// it exceeds the index range of the array.'

Installation

npm i @writetome51/array-get-and-remove-adjacent-at

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import {getAndRemoveAdjacentAt} 
    from '@writetome51/array-get-and-remove-adjacent-at';