How to write this JavaScript function properly?

Question

Currently learning web development, after completing HTML/CSS I'm now in JavaScript fundamentals (boy is it way tougher than the first two!), and in this practice project I'm looking to grab the absolute values of userGuess - secretActualNumber and computerGuess - secretActualNumber, and then compare them to see which one is closer to the secret number. So far I've tried this.

const compareGuesses = (userGuess , computerGuess, secretActualNumber) => {

    Math.abs(userGuess-secretActualNumber);

    Math.abs(computerGuess-secretActualNumber);

}

In order to compare both of those, I was thinking I need to implement the "difference" function of JS. But I've been struggling to make use that, to compare these two items, and to then result in a true/false. (true being if the user is closer, and false if the computer is closer).

Let me know what you think!

Thanks in advance

Justinas · Accepted Answer · 2020-04-17 06:23:12Z

4

Save results to variables and then compare them:

const compareGuesses = (userGuess, computerGuess, secretActualNumber) => {

    var userDiff = Math.abs(userGuess-secretActualNumber);

    var computerDiff = Math.abs(computerGuess-secretActualNumber);

    return userDiff <= computerDiff;
}

answered Apr 17, 2020 at 6:23

Justinas

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user120242 · Accepted Answer · 2020-04-17 17:55:21Z

2

This will return true only if the user is closer.

const compareGuesses = (userGuess , computerGuess, secretActualNumber) =>
  Math.abs(userGuess-secretActualNumber) < Math.abs(computerGuess-secretActualNumber);

You'll want to use <= instead of < if you want it to return true when equal.

const compareGuesses = (userGuess , computerGuess, secretActualNumber) =>
  Math.abs(userGuess-secretActualNumber) <= Math.abs(computerGuess-secretActualNumber);

edited Apr 17, 2020 at 17:55

answered Apr 17, 2020 at 6:24

user120242

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2 Comments

abdullahrathore Over a year ago

Hi there. If they are equal, I'd like the user to return true! What else would need to be adjusted to account for that?

user120242 Over a year ago

Math.abs(userGuess-secretActualNumber) < Math.abs(computerGuess-secretActualNumber) to Math.abs(userGuess-secretActualNumber) <= Math.abs(computerGuess-secretActualNumber)

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