JavaScript using variable value as name of object method

Question

I have function with parameters method and url, where method can be equal to get, post, etc. I can do like this

var req = function(method, url) {
    if(method == 'get') {
        request.get(url, function(){...});
    }
    else if(method == 'post') {
        request.post(url, function(){...});
    }
}

or use switch. But I wonder is there any way to do it without using any condition, but calculate variable value during calling of the function?

request[method](url, function(){...}); ... as long as '...' is identical — Jaromanda X
– Jaromanda X, Commented Nov 3, 2015 at 9:41

Nina Scholz · Accepted Answer · 2015-11-03 09:54:16Z

3

Just use brackets:

request[method](url, function(){...});

edited Nov 3, 2015 at 9:54

answered Nov 3, 2015 at 9:41

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Alexandr Lazarev · Accepted Answer · 2015-11-03 22:08:20Z

1

In your particular case post and get are properties of the request object, so you can access them with the help of bracket notation:

if(typeof request[method] === 'function') {
    request[method](url, function(){...});
}

You can also use eval() function but it is not recommended, because it makes your code vulnerable for injection attacks, makes it harder to read and debug, and so on.

edited Nov 3, 2015 at 22:08

answered Nov 3, 2015 at 9:49

Alexandr Lazarev

13k4 gold badges40 silver badges47 bronze badges

Collectives™ on Stack Overflow

JavaScript using variable value as name of object method

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related