Given an array of functions [f1, f2, f3, ..., fn], return a new function fn that is the function composition of the array of functions.
The function composition of [f(x), g(x), h(x)] is fn(x) = f(g(h(x))).
The function composition of an empty list of functions is the identity function f(x) = x.
You may assume each function in the array accepts one integer as input and returns one integer as output.
Input: functions = [x => x + 1, x => x * x, x => 2 * x], x = 4
// Output: 65Explanation:
Evaluating from right to left ...
Starting with x = 4.
2 * (4) = 8
(8) * (8) = 64
(64) + 1 = 65
Input: functions = [x => 10 * x, x => 10 * x, x => 10 * x], x = 1
// Output: 1000Explanation:
Evaluating from right to left ...
10 * (1) = 10
10 * (10) = 100
10 * (100) = 1000
Input: functions = [], x = 42
// Output: 42Explanation:
The composition of zero functions is the identity function
1000 <= x <= 10000 <= functions.length <= 1000- all functions accept and return a single integer