JSFiddle - React, Tailwind, and code Playground

by Graham Fairweather

HTML

<div id="result"></div>

JavaScript

var myData = new Array(['2013-01-22', 0], ['2013-01-29', 0], ['2013-02-05', 0], ['2013-02-12', 0], ['2013-02-19', 0], ['2013-02-26', 0], ['2013-03-05', 0], ['2013-03-12', 0], ['2013-03-19', 0], ['2013-03-26', 0], ['2013-04-02', 21], ['2013-04-09', 2]);

var sum = myData.reduce(function (a, b) {
    return a + b[1];
}, 0);

document.getElementById("result").textContent = sum;