Dynamic method call in javascript

Question

I'm aware that I could do this:

var myClass = { /* my class definition */ };
var methodName = 'myMethod';
myClass[methodName](p1,p2,...,pN);

But what should I do if have this:

if(data.someMethodName[0]!== undefined){ ... }

or

data.someMethodName[i].someAttribute

How do I call someMethodName dynamically meaning calling it as a string?

• Felix Kling: Exactly the same way. Which is data[someMethodName]() if I understand you correctly.
• Pointy: Also that's not a "method call", it's a "property access".

Answer 1

What you are looking for is the bracket notation:

data[someMethodName][0].
data[ someMethodName[0] ](p1, p2, ...)

• Alan Coromano: data.someMethodName[i].someAttribute how do I call this?
• Felix Kling: @Alan: Your example really isn't clear. Please be more specific.
• Alan Coromano: data[someMethodName][0] and data[ someMethodName[0] ] are not the same. are you sure it should be so?
• Alan Coromano: @FelixKling, I showed 2 examples of what I wanted to know about. What was not clear?
• Felix Kling: @Alan: Whether someMethodName is a string or an array. Whether you want to call a method with the name contained in someMethodName[0] or someMethodName. What someAttribute is. Etc. But apart from that, it's always the same. Whenever you have an invalid identifier name or a variable, you have to use bracket notation instead of dot notation.