Advanced freeCodeCamp • intermediate-algorithm-scripting

Sum All Numbers in a Range

Challenge Overview

We'll pass you an array of two numbers. Return the sum of those two numbers plus the sum of all the numbers between them. The lowest number will not always come first.

We’ll pass you an array of two numbers. Return the sum of those two numbers plus the sum of all the numbers between them. The lowest number will not always come first.

For example, sumAll([4,1]) should return 10 because sum of all the numbers between 1 and 4 (both inclusive) is 10.

💡 View Solution

function sumAll(arr) {
  let max = Math.max(...arr);
  let min = Math.min(...arr);
  let sum = 0;
  for (let i = min; i <= max; i++) sum += i;
  return sum;
}