---
title: Profile Lookup
---
# Profile Lookup

---
## Problem Explanation

*   Change the code below `// Only change code below this line` and up to `// Only change code above this line`.
*   Ensure that you are editing the inside of the `lookUpProfile()` function.
    *   This function includes two parameters, **firstName** and **prop**.
*   The function should look through the **contacts** list for the given **firstName** parameter.
    *   If there is a match found, the function should then look for the given **prop** parameter.
    *   If both **firstName** and the associated **prop** are found, you should return the value of the **prop**.
    *   If **firstName** is found and no associated **prop** is found, you should return `No such property`.
*   If **firstName** isn't found anywhere, you should return `No such contact`.


---
## Hints

### Hint 1

Use a `for` loop to cycle through the **contacts** list.

### Hint 2

Use a nested `if` statement to first check if the **firstName** matches, and then checks `if` the **prop** matches.

### Hint 3

Leave your `return "No such contact"` out of the `for` loop as a final catch-all.


---
## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript    
function lookUpProfile(name, prop) {
for (var x = 0; x < contacts.length; x++) {
    if (contacts[x].firstName === name) {
        if (contacts[x].hasOwnProperty(prop)) {
            return contacts[x][prop];
        } else {
            return "No such property";
        }
    }
}
return "No such contact";
```

#### Code Explanation

*   The `for` loop runs, starting at the first object in the **contacts** list.
*   If the **firstName** parameter passed into the function matches the value of the `"firstName"` key in the first object, the `if` statement passes.
*   Then, we use `.hasOwnProperty()` method (checks if there's a given property and returns a boolean) with **prop** as an argument. If it's true, the value of **prop** is returned.
    *   If the second `if` statement fails, `No such property` is returned.
*   If the first `if` statement fails, the `for` loop continues on to the next object in the **contacts** list.
*   If the **firstName** parameter isn't matched by the final **contacts** object, the `for` loop exits and `No such contact` is returned.

**Example Run**

*   `lookUpProfile("Akira","likes");` runs.
*   `"Akira"` is matched to the `"firstName"` key in the first object, so the `if` statement returns true.
*   `"likes"` is found within the first object, so the second `if` statement returns true.
*   The value of `"likes"` is returned - `"Pizza", "Coding", "Brownie Points"`.
</details>


<details><summary>Solution 2 (Click to Show/Hide)</summary>

```javascript
function lookUpProfile(name, prop) {
  for (var i = 0; i < contacts.length; i++) {
    if (contacts[i].firstName === name) {
      if (prop in contacts[i]) {
        return contacts[i][prop];
      } else return "No such property";
    }
  }
  return "No such contact";
}
```

#### Code Explanation
This works as the last example but uses the `in` operator to look for `prop` instead of the `hasOwnProperty()` method.

#### Relevant Links

- ["Iterate with JavaScript For Loops" - *fCC's challenge*](https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops/)
 - ["Object.prototype.hasOwnProperty()" - *MDN JavaScript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty)
- ["in operator" - *MDN JavaScript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in)
</details>