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Javascript ‘Variable’ Variables

by Gabi Solomon

If you havent figure it out by now, my "expertise" is more on the back-end ( php & mysql ) than with front end. So i sometimes look for solutions in javascript that i know how to do in php.

One of this is the concept of variable variables. A ‘variable’ variable is when the identifier of a variable is a variable itself. To be more specific, this works by taking a string as the name, and then defining a variable with that name. That variable can then be used as a normal variable.

The solution in Javascript

1. Using Eval
the first solution i found was to use eval.

PLAIN TEXT
JAVASCRIPT:
  1. var x='street';
  2. eval('name_' + x + ' = "Lincon Road"');
  3. document.write('got ' + name_street);

This should result in having a variable name_street with the value Lincon Road.

However from my small knowledge of JS, i have come to understand that you should avoid using eval when possible.
2. Better Solution - Using Window Array

PLAIN TEXT
JAVASCRIPT:
  1. var x='street';
  2. window['name_' + x] = 'Lincon Road';
  3. document.write('got ' + name_street);

Same effect, with no eval :D

This is all for today,
cheers

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