Question

77

How to check if anonymous object has a method?

rated 0 times [ 82] [ 5] / answers: 1 / hits: 176309 / 14 Years ago, wed, june 9, 2010, 12:00:00

How can I check if an anonymous object that was created as such:

var myObj = { 

    prop1: 'no',

    prop2: function () { return false; }

}

does indeed have a prop2 defined?

prop2 will always be defined as a function, but for some objects it is not required and will not be defined.

I tried what was suggested here: How to determine if Native JavaScript Object has a Property/Method? but I don't think it works for anonymous objects .

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3 Years ago

answered 14 Years ago blaisep · Accepted Answer

typeof myObj.prop2 === 'function'; will let you know if the function is defined.

if(typeof myObj.prop2 === 'function') {

    alert(It's a function);

} else if (typeof myObj.prop2 === 'undefined') {

    alert(It's undefined);

} else {

    alert(It's neither undefined nor a function. It's a  + typeof myObj.prop2);

}