How to make an javascript object to be called like a function? [duplicate]

Question

I my case, I have a class, say

var Validator = function (...) {
    ...
};
Validator.prototype.validate = function(){...}

Now as the validate function is so important, I want to change the usage validator.validate(...) into validator(...), here validator is an instance of Validator.
Is it possible and how to make it?

Currently, it's not possible to define a custom type so its instances are callable. The language standard has specified that it should be supported, but engines haven't yet implemented it. — Jonathan Lonowski
– Jonathan Lonowski, Commented Jun 29, 2015 at 4:11
Try this, jsfiddle.net/snlacks/jxnhqm64/1 That other answer is okay, but I address a potential name/memory issue. — Steven Lacks
– Steven Lacks, Commented Jun 29, 2015 at 4:22

rgruenke · Accepted Answer · 2015-06-29 04:12:15Z

0

You could create a reference to your instance method:

var validate = yourValidatorInstance.validate;

Hope this helps

answered Jun 29, 2015 at 4:12

rgruenke

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4 Comments

Aadit M Shah Over a year ago

You would have to bind the context: var validate = yourValidatorInstance.validate.bind(yourValidatorInstance);.

rgruenke Over a year ago

Yes right, lexical this would not be the same but I see no problem with using bind?

Aadit M Shah Over a year ago

To make things simpler: var validate = rebind(yourValidatorInstance, "validate"); function rebind(obj, name) { return obj[name].bind(obj); }.

rgruenke Over a year ago

Yes I like this approach using underscore/lodash u could also use _.bind

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