JavaScript: Get Argument Value and NAME of Passed Variable [duplicate]

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The short answer is that you can’t.

The longer, evil answer is that you sort of can with some real nastiness. And it only works when called from another function.

there are two interesting attributes available to you that could help

arguments.callee
caller

for fn to do something like this:

(function(){
  var showMe = function(s){
    alert(arguments.callee.caller.toString().match(/showMe\((\S)\)/)[1] + 
    ' = '+ s)
  }
  x = 1
  showMe(x)
})()

What arguments.callee.caller.toString().match(..)[1] does is look for the showMe being called in the function calling it and prints it and its value.

But this is still pretty limited because it will only hit the first call of showMe(x). So if there is two calls to it, it won’t work.

But, it was fun to play with these arcane things.

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