CODEWITHSUNDEEP
javascriptfunctionprototype
Ldrbrandon
Ldrbrandon

Reputation: 59

Invoke a function without parentheses javascript

So I wrote this String function to add stuff to each word in a sentence

String.prototype.addStuff = function() {
    return this.replace(/ /g, "-stuff ") + "-stuff"
}

I was told there was a way to invoke this function on a string without using parentheses. Anyone know how?

I tried wrapping the function declaration in parentheses and adding a pair to the end:

String.prototype.liu = (function() {
    return this.replace(/ /g, "-liu ") + "-liu"
})();

But that didn't work :/

Upvotes: 1

Views: 2154

Answers (2)

Felix Kling
Felix Kling

Reputation: 816462

You can, with Object.defineProperty and providing an accessor descriptor:

Object.defineProperty(String.prototype, 'liu', {
    get: function() {
        return this.replace(/ /g, "-liu ") + "-liu"
    }
});

"foo".liu

Although I don't know why you'd want to do that.

Upvotes: 6

Nicholas Hazel
Nicholas Hazel

Reputation: 3750

Potentially, you can't just wrap a whole function into a prototype to auto call.

Now, what you can do, is define a shared function within that prototype.

Of course, you have to call it, but that beats no answer at all.

Good Read on how prototypical inheritance works

Now, you COULD do: 

yourFunc.prototype.call('yourFunc');

But you'd have to format it properly to make it work.

Upvotes: 0

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