02 February, 2026

Skipped College! But the day was productive overall, did

• Leetcode POTD, and revised an old problem
• Continued learning Rust, and covered collections - Vectors and HashMaps
• Read about compiler design
• Worked on Casedock
• Added syntax highlighting for the code snippets for this platform.

What I learned?

Collections in Rust

github-repo

Rust standard library has a number of data structures called collections, they can contain multiple values. The data these collections point to are stored on the heap, i.e., they store dynamic data!

Vectors

Vectors are data structures like arrays, but dynamic, their size can grow or shrink. Just like the vectors in C++.

fn main() {
    // vectors
    let mut vec = Vec::new();
    vec.push(10);
    vec.push(20);
    vec.push(30);
    vec.push(40);
    println!("{:?}",vec)
}

HashMaps

Hashmaps store values in key value pairs, just like objects in JavaScript or dictionaries in Python. Common methods - insert, get, remove, clear

use std::collections::HashMap;
 
fn main() {
    // hashmaps
    let mut hash_map = HashMap :: new();
    hash_map.insert(String::from("utkarsh"), 20);
    println!("{:?}",hash_map);
 
}

That's it for today! Will see you in the next one.
Keep learning and growing.