How do I move each element in an array in 1 spot?

Question

Sorry if this is a pretty basic question, but I never had this problem before. I'll show what I mean in a pretty basic way:

Let's say I have the array [1, 2, 3]. How can I turn it into [3, 1, 2] or [2, 3, 1] (move each element 1 to the right or the left)? Thanks in advance!

You need rotate operation: https://stackoverflow.com/questions/1985260/rotate-the-elements-in-an-array-in-javascript — z1ne2wo, Nov 14 '20 at 19:28
Rotate Left: `array.push(array.shift())`, Rotate Right `array.unshift(a.pop())` — Keith, Nov 14 '20 at 19:34

score 1 · Answer 1 · edited Nov 14 '20 at 19:36

1

Try this:

var x = [1, 2, 3];

console.log(x);

// shift right
x.unshift(x.pop());

console.log(x);

// shift left

x.push(x.shift());

console.log(x);

Check here to see what these methods do.

edited Nov 14 '20 at 19:36

Keith

15,057
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answered Nov 14 '20 at 19:35

Shell Code

579
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score 0 · Answer 2 · answered Nov 14 '20 at 19:56

function shiftRight(arr) {
  if (arr.length < 2) return arr;
  return [arr[arr.length-1], ...arr.splice(0, arr.length - 1)];
}
function shiftLeft(arr) {
  if (arr.length < 2) return arr;
  return [...arr.splice(1, arr.length - 1), arr[0]];
}
console.log(shiftLeft([1, 2, 3, 4, 5]));
console.log(shiftRight([1, 2, 3, 4, 5]));

How do I move each element in an array in 1 spot?

2 Answers2