Rust for Python Developers - Operators

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Solution using an associated function

Since we learned about the associated function, let’s apply it to this problem.

struct Solution {
    nums: Vec<i32>,
}
impl Solution {
    fn new(nums: Vec<i32>) -> Solution {
        Solution {
            nums
        }
    }
    pub fn single_number(&self) -> i32 {
        let mut ans: i32 = 0;
        for n in &self.nums {
            ans ^= n;
        }
        ans
    }
}
fn main() {
    let nums1 = vec![2,2,1];
    let nums2 = vec![4,1,2,1,2];
    let ans3 = Solution::new(nums1); 
    let ans4 = Solution::new(nums2);
    println!("{}", ans3.single_number());
    println!("{}", ans4.single_number());
}

Line 6–10: We create an associated function, new as we have done it before. This new function takes one parameter nums that is a vector with items of i32.

When the parameter names and the struct field names are exactly the same, we can use the field init shorthand syntax as nums instead of nums: nums.

In the main function, we call an associated function, new and pass nums as an argument. We use method syntax to call the single_number method on the ans3 instance.

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Solution using an associated function

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