Using Objects for Lookups help++

JavaScript
1

Tell us what’s happening:
Hey! I can’t figure out what I’m doing wrong here. I think I’m confused by what they’re asking me to do.

Your code so far


// Setup
function phoneticLookup(val) {
  var result = "";

  // Only change code below this line
  var lookup = {
    "alpha": "Adams",
    "bravo": "Boston",
    "charlie": "Chicago",
    "delta": "Denver",
    "echo": "Easy",
    "foxtrot": "Frank",
  };

  // Only change code above this line
  return result;
}

// Change this value to test
phoneticLookup("charlie");

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/using-objects-for-lookups

2

Right now you never change result, so it’s always returning an empty string. You also declare lookup but never do anything with it.

3

Yeah, I think I’m not understanding what I’m supposed to do in the problem.

4

You’re close. You need to look for the index of “Chicago” using “charlie” result = obj[index]

5

Look carefully at the example code. See how they are accessing properties in an object.

6

I thought this might work, but I’m still totally confused


// Setup
function phoneticLookup(val) {
  var result = "";

  // Only change code below this line
  var lookup = {
    "alpha": "Adams",
    "bravo": "Boston",
    "charlie": "Chicago",
    "delta": "Denver",
    "echo": "Easy",
    "foxtrot": "Frank",
  };
  // Only change code above this line
  return result = lookup [val];
}

// Change this value to test
phoneticLookup[lookup];
7

I don’t see why you have to look up Charlie though…

8

“Charlie” is the index of “Chicago” in the object “lookup”.

9

You need to assign the value of result, then return it. You can’t do it in a single line like that (at least not until you start using ES6 syntax)

result = lookup[val];
return result
10

Oooooh I get it now. Thank you so much for the help!!

1 Like
11

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make easier to read.

See this post to find the backtick on your keyboard. The “preformatted text” tool in the editor (</>) will also add backticks around text.

Note: Backticks are not single quotes.

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