A tiny coding challenge

challenge.js

// Given

let array = [0, 1, 2, 3, 4, 5, 6];
let elementsToMove = [2, 3, 4];

// Tasks

// 1)
// Given an arbitrary new index, re order the array so that 
// elementsToMove is moved to the correct position

let moveElementsAfterIndex = 5;
let expectedResult1 = [0, 1, 5, 2, 3, 4, 6];


let moveElementsBeforeIndex = 0;
let extectedResult2 = [2, 3, 4, 0, 1, 5, 6];

// 2)
// The same as 1) but your array and elementsToMove should be
// something like [ {id: 0, name: 'zero' },{id: 1, name: 'one'}, {id: 2, name: 'two'}, ...]


// 3)
// How could a solution look like that can solves 1) and 2) at the same time? Is it achievable? Is it prudent? Why? Why not?

// 4)
// should you be familiar with testing, indicate how you would write a tests for your solution(s)