1. Cara Pertama
const arr = [1, 2, 3, 4];
sum = arr.reduce((a, b) => a + b, 0);
console.log(sum)
2. Cara Kedua
var arr = [1, 2, 3, 4];
var total = 0;
for (var i in arr) {
total += arr[i];
}
console.log(total)
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