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up vote 72 down vote favorite
17

Is it possible to convert an array into a function argument sequence? Example:

run({ "render": [ 10, 20, 200, 200 ] });

function run(calls) {
  var app = .... // app is retrieved from storage
  for (func in calls) {
    // What should happen in the next line?
    var args = ....(calls[func]);
    app[func](args);  // This is equivalent to app.render(10, 20, 200, 200);
  }
}
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Check for a similar question also here: stackoverflow.com/questions/2856059/… –  Wilt Feb 25 at 11:14

4 Answers 4

up vote 83 down vote accepted

Yes. You'll want to use the .apply() method. For example:

app[func].apply(this||window,args);

EDIT - Actually, my ||window bit is superfluous, since this resolves to window when called outside of a function anyway.

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10  
This is straight up G. –  Alan Jan 28 '13 at 23:40
up vote 17 down vote 
app[func].apply(this, args);
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up vote 12 down vote

You might want to take a look at a similar question posted on Stack Overflow. It uses the .apply() method to accomplish this.

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up vote 2 down vote

And another post on similar topic

And here another example that I personally liked for it's readability

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