In Javascript, how do I convert a string so that it can be used to call a property?

Question

So, I have an associative array, and the keys in the array are the properties of the object. I want the loop through the array and in each intervention do something like this:

Object.key 

This, however, does not work and results in an undefined return, not a property value.

Is there any way to do this?

Answer 1

You can use the for ... in loop:

 for (var key in obj) { //key is a string containing the property name. if (!obj.hasOwnProperty(key)) continue; //Skip properties inherited from the prototype var value = obj[key]; } 

Answer 2

You must use accessory notation properties:>

 var value = object[key]; 

This operator can even evaluate expressions, for example:

 var value = object[condition ? 'key1' : 'key2']; 

Additional Information:

• Member Operators

Remember that Array object methods that expect to work with numeric indexes can add any property name, but this is not recommended instead, instead of intensifying the Array object (i.e. var obj = []; or var obj = new Array(); ), you can use a simple instance of the object (i.e. var obj = {} or var obj = new Object();

Answer 3

Yes. Assuming key is a string, try myObject[key]