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]);sum range
>>> sum(range(4)) # 0 + 1 + 2 + 3
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