Enumerables in JavaScript

Feb 18 2012

Creating clean, readable code is a primary imperative when working with large systems. Today, I have factored the knockout view model from a single object for both projects into an inheritance based hierarchy. Now in the middle of it, I’m replacing a programmingLanguage┬ávariable with a language class that also handles the language for the style sheet (LESS, SCSS) and document (Jade, ECO).

var Language = Class.$extend({
    __init__: function () {
        LANGUAGE = {
            PYTHON: 0,
            JAVASCRIPT: 1,
            LESS: 2,
            CSS: 3,
            HTML: 4
        };
        LANGUAGE_TYPE = {

            STYLE: 1,
        }
    }
})

Then I paused and thought it didn’t seem right. I remember Enums were more terse in C. So I decided to us an Enum class.

function Enum() {
    var obj = new Object();
    for (var i = 0; i < arguments.length; i++) {
        obj[arguments[i]] = i;
    }
    return obj;
}

var Language = Class.$extend({
    __init__: function () {
        LANGUAGE = Enum('PYTHON', 'JAVASCRIPT', 'LESS', 'CSS', 'HTML');
        LANGUAGE_TYPE = Enum('SCRIPT', 'STYLE', 'DOCUMENT');
    }
})

Now I like that much better. It’s like automatic numbering, except I don’t have to read it.

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