For a fixed sized array, adds item to the end of an array and drops elements from the front, if needed

pushFixed.ts

/**
 * For a fixed sized array, adds item to the end of
 * an array and drops elements from the front, if needed
 *
 * @param item {T}- to be added to the end of the array
 * @param arr {T[]} - the array
 * @param size {number} - Max size of the array.
 * @return {T[]} The updated array
 */
function pushFixed<T>(item: T, arr: Array<T>, size: number): Array<T> {
    return arr.slice(Math.max(0, arr.length - size + 1)).concat(item)
}