CODEWITHSUNDEEP
javascriptif-statementvariables
JueK3y
JueK3y

Reputation: 317

Can pass a conditional statement as a function argument?

I have a main function and want to control 2 actions with it. Thereby I pass different variables to the function.

My question is whether I can also pack the condition of an If query into a variable.

For the one action I want to have CurrentImageNumber <= 3 as an if argument and for the other action CurrentImageNumber >= 2 in the if query.

The code would look something like this:

function imageChange() {
    CurrentImageNumber = parseInt(CurrentImageID.slice(-1)) // not a static value
    if (b) {
        // Some fancy Code where var a is used  
    }
    else {        
        // Some fancy Code where var c is used
    }
}

document.getElementById('button-1').onclick = function() {
    imageChange(a = 1, b = CurrentImageNumber <= 3, c = -3)    
}

document.getElementById('button-2').onclick = function() {
    imageChange(a = -1, b = CurrentImageNumber >= 2, c = 2)    
}

Upvotes: 1

Views: 3890

Answers (2)

Daan Sneep
Daan Sneep

Reputation: 81

Yes you could do this, but what actually happens is, the condition is checked and the predicate returns a boolean value which is parsed into the function.

This would be done like so:

doStuff(CurrentImageNumber <= 4);

function doStuff(a) {
  if (a) {
  // Execute some fancy code
  }
}

But what actually happens during runtime is equivalent to this: Lets say CurrentImageNumber == 0:

const predicateResult = CurrentImageNumber <= 4;
// Here predicateResult is of type boolean and is true
doStuff(predicateResult);

function doStuff(a) {
  if (a) {
  // Execute some fancy code
  }
}

Upvotes: 2

Barmar
Barmar

Reputation: 782693

The function needs a parameter variable to get the argument.

doStuff(CurrentImageNumber >= 2)
doStuff(CurrentImageNumber <= 4)

function doStuff(a) {
  if (a) {
    // execute some fancy code
  }
}

Upvotes: 0

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