[ 1, 2, 3, 4 ]
10
function sum(arr) { return arr.reduce((pre, next) => pre + next, 0) }
function sum(arr) { return arr.reduce(function(sum,cur){return sum+cur}) }
function sum(arr) { let a = 0; for (let i =0; i< arr.length; i ++) { a +=arr[i] } return a }
function sum(arr) { return arr.reduce((p, n) => p + n, 0); }
function sum(arr) { let count =0; arr.forEach(v=>count+=v) return count }
function sum(arr) { return arr.reduce((i,j)=>{ return i+j; }) }
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