Will return an array in which the first element is sent to the back of the array and the others moved forward. Does not mutate origional array.

sq.ts

/**
 * Functional queue shift. Will return an array in which the first element is sent to the back of the array and the others moved forward. Does not mutate origional array.
 * @param arr The array you want to shift.
 * @returns The new shifted array.
 */
function shiftQueue<T>(arr: Array<T>): Array<T> {
    const [first , ...rest] = arr
    return [...rest, first]
}