arrays Various ways of accessing arrays Calculate Single Value from Array in Javascript


Example

var arr = [1, 2, 3, 4, 5];
var sum = arr.reduce((prev, curr) => prev + curr);
console.log(sum);
// Output: 15

You can also specify an initial value

var arr = [1, 2, 3, 4, 5];
var sum = arr.reduce(function (previousValue, currentValue, currentIndex, array) {
    return previousValue + currentValue;
}, 100);
console.log(sum)
// Output: 115