Basic JavaScript #104: Profile Lookup (help)

JavaScript
1

I’ve completed this exercise, but I’m left with one question.

This code does work:

function lookUpProfile(name, prop) {
  for (let i = 0; i < contacts.length; i++) {
    if (contacts[i].firstName === name) {
      if (contacts[i].hasOwnProperty(prop)) {
        return contacts[i][prop];
      } else {
        return 'No such property';
      }
    }
  }
  return 'No such contact';
}

This code does not work:

function lookUpProfile(name, prop) {
  for (let i = 0; i < contacts.length; i++) {
    if (contacts[i].firstName === name && contacts[i].hasOwnProperty(prop)) {
      return contacts[i][prop];
    } else if (contacts[i].firstName === name) {
      return 'No such property';
    } else {
      return 'No such contact';
    }
  }
}

The only difference that seems important, at least to my novice eyes, is the return 'No such contact'; statement being outside the for loop in the code block that passes, but I don’t understand why that makes a difference.

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.61 Safari/537.36

Challenge: Profile Lookup

Link to the challenge:

2

else in the wrong solution would be executed on the first contact that doesn’t satisfy first two conditions, and it will not go to check other contacts.

3

it will not go to check other contacts.

I think I understand, thank you!

4

Look closely does the contacts array has an object with properties you are testing ?

6

Yes, the issue seemed to be returning the incorrect response when i !== firstName.

7

I mean you have to use id before accessing object from the array

8

You mean the index position? That’s i.

11

i is a variable, when it is passed to the array, it is a number. That number cycles through the array in a loop. If i = 0, then console.log(arr[i]) is equal to console.log(arr[0]), which prints the first index:

{ firstName: 'Akira',
  lastName: 'Laine',
  number: '0543236543',
  likes: [ 'Pizza', 'Coding', 'Brownie Points' ] }
12

Sorry I confused this challenge with another,

13

this will end your loop if it does not match the first contact

14

Oh I see, is that because return is always the end of a function?

15

yep, you got it, it will end loop and return from function

16

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