code-breaking | Code-Breaking Puzzles | Game Engine library

I have an array of predicates coming into a function we'll call searchForAcceptableNumber.

For some background: MasterMind® is a code-breaking game invented in the early 1970’s by Mordechai Meirovitz. In this game, one player – the code master – is responsible for generating a code that consists of a sequence of four colors. A second player – the code breaker – attempts to guess the code. After each guess, the code master provides feedback about the guess. Specifically, the code master will tell the code breaker how many colors were correct and how many of the colors are in the correct position. The code-breaker continues to guess the code until they are able to successfully break the code. The code breaker’s “score” is the number of guesses that it takes break the code.

The objective of this program is to:

1. Define the valid colors.
2. Use the valid colors to generate the secret code.
3. As long as I haven’t guessed the code yet: Ask the user to guess; update the number of guesses. Make sure the guess is valid
4. Determine the number of correct Colors
5. Determine the number of correct Locations
6. Provide this feedback to the code breaker
7. Report the final score to the user

I have only confidently gotten through steps 1 & 2. My question is how I can get the isValidGuess function to determine that there is only validColors present. As it is written right now, the function is not incorporating the validColors parameter, and I am not entirely sure why. For each function, there is a brief explanation of what the function should be doing.

-Note- I do not want someone to write the entire code for me, just to help me with the isValidGuess function.