Returning an array without a removed element? Using splice() without changing the array?

You want slice:

Returns a one-level deep copy of a portion of an array.

So if you

a = ['one', 'two', 'three' ];
b = a.slice(1, 3);

Then a will still be ['one', 'two', 'three'] and b will be ['two', 'three']. Take care with the second argument to slice though, it is one more than the last index that you want to slice out:

Zero-based index at which to end extraction. slice extracts up to but not including end.

as suggested by the answer below, here is a code snapshot

var myArray = ["one", "two", "three"];
var cloneArray = myArray.slice();

myArray.splice(1, 1);

console.log(myArray);
console.log(cloneArray);

Use this:

function spliceNoMutate(myArray,indexToRemove) {
    return myArray.slice(0,indexToRemove).concat(myArray.slice(indexToRemove+1));
}