Coding⏱️ 3 min read📅 2026-06-04

How to Fix: What do I have to do to solve a "use of moved value" error?

Fix vectorIsPrime function to correctly check for prime numbers in Rust.

Quick Answer: The issue lies in the line `if num > i && num % i != 0`. It should be `if num > i && num % i == 0` to correctly check if a number is divisible by another.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The 'use of moved value' error occurs when you try to use a value after it has been moved into another function or scope. In this case, the issue arises from using the `primes` vector in the `vectorIsPrime` function without cloning or borrowing it.

This error is frustrating because it can cause unexpected behavior and make it difficult to debug code. However, by following the steps outlined below, you should be able to resolve the issue and continue working on your Project Euler 7 solution.

🔍 Why This Happens

  • The primary reason for this error is that the `primes` vector is being moved into the `vectorIsPrime` function. When a value is moved, it can no longer be used in its original location.
  • An alternative reason for this error could be that the `primes` vector is not properly cloned or borrowed before being passed to the `vectorIsPrime` function.

✅ Best Solutions to Fix It

Cloning the `primes` Vector

  1. Step 1: To fix this issue, you need to clone the `primes` vector using the `clone()` method. Add the following line of code before calling the `vectorIsPrime` function: `let primes_clone = primes.clone();`. This will create a new copy of the `primes` vector that can be used by the `vectorIsPrime` function without affecting the original vector.
  2. Step 2: Modify the `vectorIsPrime` function to accept a reference to the `primes` vector instead of moving it. Change the function signature from `fn vectorIsPrime(num: u64, p: Vec) -> bool` to `fn vectorIsPrime(num: u64, p: &Vec) -> bool`. This will allow you to borrow the `primes` vector without moving it.
  3. Step 3: Alternatively, you can create a new vector to store the prime numbers and push them into it instead of modifying the original `primes` vector. This approach is more efficient but may require additional memory allocation.

Borrowing the `primes` Vector

  1. Step 1: To fix this issue, you need to borrow the `primes` vector using a reference. Modify the function signature of `vectorIsPrime` from `fn vectorIsPrime(num: u64, p: Vec) -> bool` to `fn vectorIsPrime(num: u64, p: &Vec) -> bool`. This will allow you to borrow the `primes` vector without moving it.
  2. Step 2: Add a line of code to clone the `primes` vector before passing it to the `vectorIsPrime` function. You can use the `clone()` method as mentioned earlier.

💡 Conclusion

By cloning or borrowing the `primes` vector, you should be able to resolve the 'use of moved value' error and continue working on your Project Euler 7 solution. Remember to test your code thoroughly to ensure that it produces the correct results.

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