#iterators code explainers

rust

use std::collections::HashMap;
 
pub fn word_frequencies(text: &str) -> HashMap<String, usize> {
    let mut counts: HashMap<String, usize> = HashMap::new();

Counting and ranking words in Rust

hashmap iterators sorting

Intermediate 7 steps

rust

use std::fs::File;
use std::io::{self, BufRead, BufReader};
use std::path::Path;

Buffered log scanning in Rust

buffered-io error-handling streaming

Intermediate 9 steps

javascript

class Stack {
  #items = [];
 
  push(value) {

Building a Stack with private fields

data-structures encapsulation iterators

Intermediate 7 steps

rust

/// A custom iterator that yields Fibonacci numbers up to a maximum value.
pub struct Fibonacci {
    current: u64,
    next: u64,

Building a custom Fibonacci iterator in Rust

iterators traits state-machine

Intermediate 6 steps

ruby

class LinkedList
  include Enumerable
 
  Node = Struct.new(:value, :next_node)

Building an enumerable linked list in Ruby

linked-list enumerable data-structures

Intermediate 7 steps