Bizarre Object notation with JavaScript

While browsing through a Library called WebApp.net, I stumbled upon this interesting piece of code:

var $h = {
    get HEAD() { return 0 },
    get BACK() { return 1 },
    get HOME() { return 2 },
    get LEFT() { return 3 },
    get RIGHT() { return 4 },
    get TITLE() { return 5 }
};
var $d = {
    get L2R() { return +1 },
    get R2L() { return -1 }
};

Having some knowledge of JS, I find this code rather confusing. Chrome interprets it as an Object with properties like $h.HEAD set to certain numbers after the return statement. It also seems to involve getters within $h.

I'm curious to learn more about this. Unlike Chrome, IE fails to interpret this code, so I need to figure out how to create something similar that works in IE.

javascriptgoogle-chromeinternet-explorerjavascript-objects

Answer №1

You have stumbled upon getters.

Utilizing a getter allows you to trigger a function when accessing a property of an object. Additionally, it provides a level of protection for object properties, as the value of a getter cannot be directly altered.

Getters and setters have been supported in Internet Explorer since IE9 as well.

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