January 2017
Beginner to intermediate
550 pages
10h 6m
English
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IIFE versus blocks
As ES5 did not provide block scope, a popular pattern to achieve block scope was to use immediately invoked function expressions (IIFE), for example:
(function () {
var block_scoped=0;
}());
console.log(block_scoped); //reference error
With ES6's support for block scopes, you can simply use a let or const declaration.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.