Tim Hoolihan

Arrays as Objects in Javascript

Rhino Prompt…

js> a[0] = 1;
js> a.print = function () {for(var e in this) print ("a[" + e + "] = " + a[e]);};

function () {
    for (var e in this) {
        print("a[" + e + "] = " + a[e]);
    }
}

js> a.print();
a[0] = 1
a[print] = 
function () {
    for (var e in this) {
        print("a[" + e + "] = " + a[e]);
    }
}

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Comments

One response to “Arrays as Objects in Javascript”

  1. Tim Avatar
    Tim

    Beyond demonstrating how you can hook a function into an array in javascript, the snippet shows that “this” is very powerful keyword in dynamic languages. While in static languages, “this” often only serves for clarity.