sum(range(n)) code example

Example 1: how to use sum with range python

res = sum(x for x in range(100, 2001) if x % 3 == 0)

Example 2: Sum All Numbers in a Range

const sumAll = arr => {
   let maxNumber = Math.max(...arr)
   let minNumber = Math.min(...arr)
   let numbersArray = []

   for(let i = minNumber; i <= maxNumber; i++){
     numbersArray.push(i)
   }
   return numbersArray.reduce((acc, cur) => acc + cur, 0)
}

sumAll([1, 4]);