sum of all numbers in an array javascript
const arrSum = arr => arr.reduce((a,b) => a + b, 0)sum of all numbers in an array javascript
const arrSum = arr => arr.reduce((a,b) => a + b, 0)the sum of all first n natural numbers js
S(n) = n * (n + 1) / 2Copyright © 2021 Codeinu
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