reduce()

ES5+

Executes a reducer function on each element of the array, resulting in a single output value.

Syntax

array.reduce(callback(accumulator, currentValue, index, array), initialValue)

callback Function

A function to execute on each element

initialValue any optional

Initial value for the accumulator

any

The single value that results from the reduction

JavaScript

const numbers = [1, 2, 3, 4];
const sum = numbers.reduce((acc, cur) => acc + cur, 0);
console.log(sum);

Output:

// 10