Clever JS Snippets

JavaScript

// clever summing of numbers using eval - http://stackoverflow.com/a/1230461/324094
var a = [1, 2, 3, 4, 5];
var sum = eval(a.join('+'));

// + usually means `valueOf`, while ''+ means `toString`
var now = +new Date();
var str = 1 + 2 + ''

//