Change Value Of Passed Variable In Javascript Without Return?

I have the function change(x) which takes an integer and changes its value function change(x) { x=26; } Then I make a variable and I try to change its value window.onload=funct

Solution 1:

JavaScript always passes arguments by value, so you can't do it as you originally written.

However, an object's value is a reference, so you could use an object.

However, that would be confusing for this use case. You should have that function return the transformed number.

Solution 2:

You cannot pass a variable by reference like that (or at all). What you can do is pass an object and modify its properties:

functionchange(obj) {
    obj.a = 4;
}

var obj = {a: 0};
change(obj);

// obj.a is "4" now

Solution 3:

I did this and it worked:

functionchange(x) {   
  x=26;  
  return x;  
}  
  window.onload=function(){  
  var a = 10;  
  console.log(change(a));  
}

Hope it helps