rustOff-by-oneEasy

Off-by-one inclusive range panic in slice window

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BugFind the bug and fix the code

What it should do

Extract full vector slice as vector. Example: slice_window_bounds([1, 2, 3]) -> [1, 2, 3]

What happens instead

panicked at 'range end index 3 out of range for slice of length 3'

fn slice_window_bounds(nums: Vec<i32>) -> Vec<i32> {
    let len = nums.len();
    if len == 0 {
        return vec![];
    }
    // 0..=len is inclusive, accessing index len which is out of bounds
    nums[0..=len].to_vec()
}

fn main() {
    println!("{:?}", slice_window_bounds(vec![1, 2, 3]));
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

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This bug belongs to the off-by-one errors pattern

The loop that runs one time too many, the slice that drops the last item, the index that starts in the wrong place.

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fn slice_window_bounds(nums: Vec<i32>) -> Vec<i32> { let len = nums.len(); if len == 0 { return vec![]; } // 0..=len is inclusive, accessing index len which is out of bounds nums[0..=len].to_vec() } fn main() { println!("{:?}", slice_window_bounds(vec![1, 2, 3])); }

Off-by-one inclusive range panic in slice window

What it should do

What happens instead

More off-by-one errors to practise

Off-by-one inclusive range panic in slice window

What it should do

What happens instead

More off-by-one errors to practise