Question

let’s suppose we have a javascript function and we want to check if the second parameter is undefined, in that case we want to assign it a value such as

function myFunc(a,b){ 
   if(typeof b==="undefined" ){
      b=0;
   }
   //do stuff
}

Does the variable b in the if block still refer to the function’s parameter or a global variable named b is created?

Cheers

Answer 1

code:

function myFunc(a,b){
   if(typeof b==="undefined" ){
      b=0;
   }
    console.log('b from myFunc:'+b)
}
myFunc(5);
console.log('global:'+b)

output:

b from myFunc:0

b is not defined