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We have an array of objects representing different people in our contacts lists.

A lookUpProfile() function that takes firstName and a property (prop) as arguments has been pre-written for you.

The function should check if firstName is an actual contact's firstName and the given property (prop) is a property of that contact.

If both are true, then return the value of that property.

If firstName does not correspond to any contacts then return No such contact.

If prop does not correspond to any valid properties then return No such property.

• 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.

• Challenge: Accessing Objects Properties with Bracket Notation
• Challenge: Iterate with JavaScript For Loops

Use a for loop to cycle through the contacts list.

try to solve the problem now

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

try to solve the problem now

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

try to solve the problem now

Solution ahead!

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

• 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".

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Thanks @leftynaut for your help with Checkpoint: Profile Lookup

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