Basic JavaScript - Profile Lookup

JavaScript
1

Tell us what’s happening:
Describe your issue in detail here.

I’m sorry, the lesson keeps getting harder and harder.
I somehow cannot get the last requirement to go through even though I translate this line to code directly.

  • If firstName is found and no associated prop is found, you should return No such property.

The requirement I’m stuck atm is:
lookUpProfile("Akira", "address") should return the string No such property

I’m not sure where I go wrong here.

   **Your code so far**

// Setup
const contacts = [
 {
   firstName: "Akira",
   lastName: "Laine",
   number: "0543236543",
   likes: ["Pizza", "Coding", "Brownie Points"],
 },
 {
   firstName: "Harry",
   lastName: "Potter",
   number: "0994372684",
   likes: ["Hogwarts", "Magic", "Hagrid"],
 },
 {
   firstName: "Sherlock",
   lastName: "Holmes",
   number: "0487345643",
   likes: ["Intriguing Cases", "Violin"],
 },
 {
   firstName: "Kristian",
   lastName: "Vos",
   number: "unknown",
   likes: ["JavaScript", "Gaming", "Foxes"],
 },
];

function lookUpProfile(name, prop) {
 // Only change code below this line
for (let i = 0; i < contacts.length; i++) {
  if (contacts[i].firstName === name) {
      return contacts[i][prop];
  }
  else if (contacts[i].firstName === name && contacts[i].hasOwnProperty(prop) == false) {
    return "No such property";
  }
}
return "No such contact";
 // Only change code above this line
}

lookUpProfile("Akira", "likes");

   **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Profile Lookup

Link to the challenge:

2

Hi

Look at your first if statement:

if (contacts[i].firstName === name) {
      return contacts[i][prop];
  }

If the name matches, what does your code do?
(Remember - a return statement terminates the function.)

3

give the contacts property at that “i”?

Does return terminate the function when “else if” usually continues if the first condition is wrong until “else” ?

4

Yes - but if that “i” doesn’t have a matching property then it will return undefined.

Try this and see what’s returned.
console.log(lookUpProfile("Akira", "address"));

You’ll need to rethink your logic a little.
You can always post again here if you can’t figure it out.

5

I actually did check console.log(lookUpProfile(“Akira”, “address”)); before posting here.
And it is “undefined”.

So I guess you unintentionally answer for me why I kept getting undefined and where it comes from.

6

wait…but why can’t I continue with else if?
Why does
if (contacts[i].firstName === name) {
return contacts[i][prop];
}
giving me two results?

Is it because it every number of i it puts, it will bring out results hence the undefined when “i” not matched?

7

In the “Akira” example, your first if statement is true.
The name matches.

So the code inside that if block is executed.
And a return statement always terminates the function.

9

Well yes, if condition is met in the if, the return will return the result and terminate…
But anyway, since you mention that the if condition here going through [i] will give “undefined” when condition not met,…

I plug that hole. xD

function lookUpProfile(name, prop) {
// Only change code below this line
for (let i = 0; i < contacts.length; i++) {
if (contacts[i].firstName === name) {
return contacts[i][prop] || “No such property”;
}
else if (contacts[i].firstName === name && contacts[i].hasOwnProperty(prop) == false) {
return “No such property”;
}
}
return “No such contact”;
// Only change code above this line
}

lookUpProfile(“Akira”, “likes”);

10

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