#composition code explainers

ruby

class Pipeline
  def initialize
    @middlewares = []
  end

Building a middleware pipeline in Ruby

closures middleware composition

Advanced 8 steps

rust

use axum::{
    body::Body,
    http::{Method, StatusCode, Uri},
    response::{IntoResponse, Response},

Nesting routers and JSON fallbacks in Axum

routing http json-responses

Intermediate 7 steps

php

namespace App\Http\Filters;
 
use Closure;
use Illuminate\Database\Eloquent\Builder;

Composable query filters with Laravel's Pipeline

pipeline query-builder single-responsibility

Intermediate 7 steps

typescript

function* map<T, U>(source: Iterable<T>, fn: (value: T, index: number) => U): Generator<U> {
  let index = 0;
  for (const value of source) {
    yield fn(value, index++);

Building a lazy iterator pipeline in TypeScript

generators lazy-evaluation iterators

Intermediate 7 steps

ruby

require "forwardable"
 
class ShoppingCart
  extend Forwardable

Delegation in Ruby with Forwardable

delegation composition enumerable

Intermediate 9 steps

ruby

class WeightedSampler
  def initialize(weights)
    @entries = weights.to_a
    @total = @entries.sum { |_, w| w }

Weighted random sampling with binary search

weighted-sampling binary-search cumulative-sum

Intermediate 7 steps

php

<?php
 
namespace App\Http;

Building an onion middleware pipeline in PHP

middleware closures array-reduce

Advanced 9 steps

go

package main
 
import (
	"net/http"

How route groups nest in Gin

routing middleware api versioning

Intermediate 6 steps

go

package geometry
 
import "fmt"

Implementing fmt.Stringer in Go

interfaces stringer composition

Beginner 5 steps