Slice Manipulation

Now that you have an overview of slices, let's make it a little bit more challenging. In this problem, you will implement a function that updates specific elements of a mutable slice.

Your Task

Write a function update_slice(slice: &mut [i32], indices: &[usize], value: i32) that updates specific elements of a mutable slice. The function should:

  1. Take a mutable slice of integers (slice) as the first argument.
  2. Take a slice of indices (indices) that specify which elements of the mutable slice to update.
  3. Update each specified index in the slice to the given value.

The function should handle the following:

  • If an index in indices is out of bounds for the slice, the function should skip it without causing a panic.
  • Modify only the elements specified by valid indices.
  • Ensure that out-of-bound indices in the indices slice do not cause runtime errors.
  • Remember that slices are views into arrays or vectors; they cannot be resized, but their contents can be modified.

How it Works

 
let mut data = vec![1, 2, 3, 4, 5];
update_slice(&mut data, &[1, 3, 4], 7);
assert_eq!(data, vec![1, 7, 3, 7, 7]);
 
let mut data = vec![10, 20, 30];
update_slice(&mut data, &[2, 5], 100); // Index 5 is out of bounds
assert_eq!(data, vec![10, 20, 100]);

Hints

If you're having trouble, consider these hints:

Click here to reveal hints
  • Use the .get_mut(index) method to safely access a mutable reference to an element at a given index. This avoids panics for out-of-bound accesses.
  • A for loop is useful for iterating through the indices slice.