Question

How to reduce the values of an array to a single value in JavaScript

Answer 1

var numbers = [3, 1, 100, 90];

function sum(total, num) {
    return total + num;
}

var n = numbers.reduce(sum);

document.write(n);


/*

run:

194

*/

 

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Answer 2

var sum = [3, 1, 100, 90].reduce(function(total, num) {
  return total + num;
}, 0);

document.write(sum);


/*

run:

194

*/

 

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