array-reduce

by Varun Sukheja

HTML

<script src="https://cdn.jsdelivr.net/gh/eu81273/jsfiddle-console/console.js"></script>

JavaScript

const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;

// 1 + 2 + 3 + 4
console.log('array1.reduce(reducer) ====',array1.reduce(reducer));
// expected output: 10

// 5 + 1 + 2 + 3 + 4
console.log('array1.reduce(reducer,5) ====',array1.reduce(reducer, 5));
// expected output: 15