11

This way I could have a function that says whatever_way_you_do_this = something. Is this possible? Basically I could tell a function which variable I want to set by giving it a string that holds the name of the variable.

Thanks

MetaGuru
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  • Not a duplicate of "Get global variable dynamically by name string in JavaScript", this question doesn't say anything about the variable being global. And it matters. – T.J. Crowder Apr 19 '17 at 09:10

4 Answers4

20

Given:

var x = {
    myproperty: 'my value'
};

You can access the value by:

var value = x['myproperty'];

If you're looking for a global variable, then you would check its container (window);

var value = window['x']['myproperty'];
Ken Browning
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7

You can use 

eval(variableString);

Proceed with caution as many don't recommend using eval()

WoJ
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Mahesh Velaga
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  • More versatile answer. The current best answer can only access properties. This can access both plain variables and properties `eval("x.myproperty");`. Out of curiosity, why is eval not recommended? – Bryant James Jan 05 '17 at 15:23
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    @BryantJackson security is one big reason, you really don't want to create the possibility of arbitrary code execution on a production machine – nickford Apr 03 '17 at 18:34
4

If it is a global variable named myVar, you can use:

window["myVar"]
Gabe Moothart
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2

The eval function can access a variable from a string containing the variable's name.

eval('baseVariableName'+index) = 'something';
Dorian Damon
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