How to use a variable as a function parameter in Javascript?

Question

I'm a big noob at JS,so if my question is hard to understand then sorry😂. I'm writing a program in JS(Electron) that provides a user interface for another program I made in C++, so I'm basically rewriting it in JavaScript.

I want to use this JSON variable(or whatever it's called) in my code.

var ShowSecondsInSystemClock = '{"name":"ShowSecondsInSystemClock","Description":"Patches the System Tray clock to show seconds","ExplorerRestartRequired":"true","category":"UI-Tweaks","badges":"UITweaks"}'

Then I would like to use this function where the parameter of the function "ShowSecondsInSystemClock" is.

function TweakParser(TweakName, NeeddedReturn) {
  if (NeeddedReturn == "Description") {
    //I'm trying to use TweakName as the parameter of parse(),but it only 
    //accepts the name of the Tweak directly
    var NeeddedTweakInfo = JSON.parse(TweakName)
    return NeeddedTweakInfo.Description
  }
}

Because there will be many Tweaks, the usecase of this particular function is for example

//I use a non-existing tweak here for the example
TweakParser("RemoveArrowsFromShortcut","Description")

What I want TweakParser to do now is use RemoveArrowsFromShortcut as the parameter of JSON.parse() but it only accept the name of the JSON variable directly and when I input the name of the first parameter of the TweakParser() function it gives me an error, because the parameter(a variable) itself is not a JSON variable (or whatever it's called like).

So my question to you is:

How can I use the string that the first parameter of TweakParser() contains as a parameter for the JSON.parse() function?

so wait, is the TweakName supposed to be your JSON object, like your ShowSecondsInSystemClock var? — basic
– basic, Commented Aug 27, 2018 at 14:04
Well you are currently passing it as a string, not the actual variable. Have you tried dropping the quotes to pass the actual object? — basic
– basic, Commented Aug 27, 2018 at 14:06
@basic A JSON is a string, that's fine - and it's passed to JSON.parse to create the object — Bergi
– Bergi, Commented Aug 27, 2018 at 14:06

аlex · Accepted Answer · 2018-08-27 14:09:00Z

2

You need to create mapping like a schema 'key': variable example:

{
  'RemoveArrowsFromShortcut': ShowSecondsInSystemClock
}

Full example:

  var ShowSecondsInSystemClock = '{"name":"ShowSecondsInSystemClock","Description":"Patches the System Tray clock to show seconds","ExplorerRestartRequired":"true","category":"UI-Tweaks","badges":"UITweaks"}' 

  var mapping = {
    RemoveArrowsFromShortcut: ShowSecondsInSystemClock 
  };

  function TweakParser(TweakName, NeeddedReturn) {
  
    if (NeeddedReturn == "Description") {
      
      var NeeddedTweakInfo = JSON.parse(mapping[TweakName]); // PAY ATTENTION HERE
      return NeeddedTweakInfo.Description
    }
  }

  var result = TweakParser("RemoveArrowsFromShortcut","Description")

 console.log('result', result)

answered Aug 27, 2018 at 14:09

аlex

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