Difference of Max and Min Numbers in Array

Create a function that takes an array and returns the difference between the biggest and smallest numbers.

Examples

diffMaxMin([10, 4, 1, 4, -10, -50, 32, 21]) ➞ 82
// Smallest number is -50, biggest is 32.

diffMaxMin([44, 32, 86, 19]) ➞ 67
// Smallest number is 19, biggest is 86.

Notes

N/A