JSFiddle - React, Tailwind, and code Playground

by zerkms

JavaScript

var arr = [[1, 5], [4, 7], [3, 8], [2, 3],  
 [12, 4], [6, 6], [4, 1], [3, 2], 
 [8, 14]];

console.log(Math.max.apply(Math, arr.map(function(i) {
    return i[0];
})));