Testing Objects for Properties in javascript

[vickynishad]

its in the code challenge. then what else I would say

[ilenia]

but it is not in the challenge
this is the starting code, the object is not there

can you say why you add that?

 function checkObj(obj, checkProp) {
  // Only change code below this line

}

[vickynishad]

so i have made a mistake then help me directly

[ilenia]

the best way to explain depends on your answer to the question

[JeremyLT]

We are trying to establish what you do and do not understand. Without that, my explanation would have to start at the basics of how a function works and would be very long.

[vickynishad]

i got it. i shouldnot added in the code.

[JeremyLT]

Sure, but do you know why that shouldn’t be there? Understanding how function arguments work is important.

[vickynishad]

i got it sir. thanks for responding. i am beginner so didnt get you earlier.

[vickynishad]

yeah i want to know this.

[lasjorg]

Your checkObj function is passed an object as an argument, it gets passed to the obj parameter.

You are overwriting the parameter obj with the object you created inside the function. The parameter and the object share the same identifier name.

function checkObj(obj, checkProp) {
  // Only change code below this line
  var obj = {
    gift: 'This value is not in the object passed to the function',
    pet: 'kitten',
    bed: 'sleigh',
    city: 'Seattle',
  };
  if (obj.hasOwnProperty(checkProp)) {
    return obj[checkProp];
  } else {
    return 'Not Found';
  }
}

console.log(checkObj({ gift: 'pony', pet: 'kitten', bed: 'sleigh' }, 'gift'));
// This value is not in the object passed to the function

[terribeary]

Hi, I had a similar question and Randall explained it very succinctly in the bottom of the thread:

Error after inserting variable properties?

That makes sense. But I still have to put in var myObj = { gift: “pony”, pet: “kitten”, bed: “sleigh” }; inside the brackets or checkObj(“gift”); would not know where to look. Am I correct that you are saying it should be placed after the return “Not Found”; }

What you are wondering is what I was wondering. You do not have to spell out those variables as you did in var obj.

If you set up the function at the top, checkObj correctly with the if statement, it will return obj[checkProp].

when you console.log you want to set it up as lasjorg did with the gift: ‘pony’, etc, in the parentheses to log the result correctly.

If you tried to console.log all those parameters with different values like

gift: ‘cat’ , pet: ‘dinosaur’ , bed: ‘waterbed’

That’s when you will get the Not Found