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javascriptfunctionattributesfunction-calls

Javascript function call to have optional attributes

Can a function be defined in javascript in a way that attributes are optional in a function call?

for example, I have the below function defined: 

function abc(x1,y1,x2,y2){
//execution
}

What I am willing to do is something like this: 

function abc(x1,y1,x2,y2,id){
if(id!=''){
//do something
}else{
// do something else
}
}

function call: abc(1,2,3,4);

Will the above function still work or give an error?

Solution

  • Test it as typeof id !== 'undefined'

    function abc(x1, y1, x2, y2, id) {
  if (typeof id !== 'undefined') {
    console.log(id);
  } else {
    console.log(arguments);
  }
}

abc(1, 2, 3, 4);
console.log('-------------------');
abc(1, 2, 3, 4, 'YOUR_ID');