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Javascript for n00bs

Recently a friend asked me for an easy way to learn JavaScript. I can’t remember how I learned myself, but I do remember some things that were surprising coming from other languages, or that I had guessed wrong or took me a while to understand for whatever reason, despite not really being complicated at all.

As I wrote the list for her anyway, I figured it could be useful for other people, too, so here it goes, somewhat edited:

Example of two levels of functions:

// Imagine this function is a method
function foo(widgetList) {
    // Save the value of "this" for later
    var that = this;
    widgetList.forEach(function() {
        // Here, "this" points to widgetList. If we need
        // the object the "foo" method was called on, we
        // need to refer to "that", saved above
    }, widgetList);
}

Resources (that I haven’t read myself, but seem useful):