Declare methods dynamically in Javascript

Question

I have a model and want to declare functions for all attributes on it.

Let's say these are the attributes: [firstName, lastName]

I want to be able to get them with:

person.firstName()
person.lastName()

How do I define methods programmatically from an array of strings?

Is person a singleton or do you have multiple such objects? — Šime Vidas
– Šime Vidas, Commented Nov 27, 2011 at 3:53

alex · Accepted Answer · 2011-11-27 03:53:25Z

3

['firstName', 'lastName'].forEach(function(funcName) {
    var prop = person[funcName];    
    person[funcName] = function() {
        return prop;
    }
});

CodePad.

If you didn't know the properties in advance, you could use Object.keys() if the environment supports it, or use a for ( in ) loop to get the keys.

CodePad.

edited Nov 27, 2011 at 3:53

answered Nov 27, 2011 at 3:47

alex

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1 Comment

ajsie Over a year ago

I don't know the properties in advance so your second solution fits. Really great answer, thanks!

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