PHP $$ conterpart in JS

Question

Is there any counterpart for the following statement in JS:

foreach (['a'=>1,'b'=>2] as $k->$v) {
        $$k=$v;
}

You may suggest the following code. But it declares the variables in the global scope.

for(k in {a: 1, b: 2})
  {
      window[k]=this[k];
  }

What scope do you want it in? Your PHP could be in function, file, or global scope depending upon where you are, so it's not clear to me what JS equivalent you want. — bishop, Jan 24 '14 at 21:53
Is this absolutely necessary? Usually it is not, can and should be avoided — kero, Jan 24 '14 at 21:54
Isn't `this` the right thing to use in [function scope](http://stackoverflow.com/questions/1963357/this-inside-function)? `this[k] = v` — grebneke, Jan 24 '14 at 22:00
Well, the only way to emulate variable variables in Javascript is with a context object (eg, `this` or `window`), but functions generally are not objects so "this" might not refer to the particular object. You might be able to use the prototype `Function[k]`, but that sounds dangerous. I would put this in some kind of context object and pass that around. — bishop, Jan 24 '14 at 22:01
checkout this http://stackoverflow.com/questions/5187530/variable-variables-in-javascript — user583576, Jan 24 '14 at 22:20
Variable variables are a horrible even in a language like PHP. Please don't try to bring them to javascript. — John Dvorak, Jan 25 '14 at 03:20

score 0 · Answer 1 · answered Jan 25 '14 at 03:30

0

You should not use variable variables in PHP anyway. Use arrays instead. window[k] is an example of using an array instead (well, an object, but close enough).

As you discovered, there is no way to use local scope variables in JavaScript, so do yourself a favour, use objects ;)

answered Jan 25 '14 at 03:30

Niet the Dark Absol

320,036
81
464
592

Please help community moderation by voting to close as a duplicate rather than posting your own answer. Also, I'm not sure this really _is_ an answer. – John Dvorak Jan 25 '14 at 03:36

PHP $$ conterpart in JS

1 Answers1