Code Explainers

Code explainers tagged #environment-variables

typescript 
import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';
import * as Joi from 'joi';
 

Validating env config at boot in NestJS

configuration schema-validation environment-variables
Intermediate 8 steps
ruby 
module Dotenv
  LINE = /\A\s*(?:export\s+)?([A-Za-z_][A-Za-z0-9_]*)\s*=\s*(.*?)\s*\z/
 
  module_function

Parsing a .env file in Ruby

parsing regular-expressions environment-variables
Intermediate 8 steps
java 
public record AppConfig(
        String host,
        int port,
        String databaseUrl,

Loading typed config from env vars in Java

records configuration environment-variables
Intermediate 6 steps
go 
package config
 
import (
	"fmt"

A thread-safe config singleton in Go

singleton concurrency environment-variables
Intermediate 7 steps
python 
import os
from pathlib import Path
 
BASE_DIR = Path(__file__).resolve().parent.parent.parent

How a Django settings module is wired

configuration environment-variables middleware
Intermediate 8 steps
ruby 
module AppConfig
  module_function
 
  def fetch(key, default: nil, required: false)

Typed environment variable config in Ruby

environment-variables type-coercion configuration
Intermediate 7 steps
python 
import os
from datetime import timedelta
 
 

Class-based config in a Flask app factory

configuration app-factory inheritance
Intermediate 7 steps
php 
<?php
 
namespace App\Config;
 

Writing a .env file loader in PHP

parsing environment-variables configuration
Intermediate 9 steps
python 
import os
from dataclasses import dataclass
from functools import lru_cache
 

Loading typed config from environment variables

configuration environment-variables type-coercion
Intermediate 6 steps
go 
package config
 
import (
	"fmt"

Loading typed config from environment variables in Go

configuration environment-variables type-parsing
Beginner 8 steps
rust 
use std::env;
use std::time::Duration;
 
#[derive(Debug, Clone)]

Loading typed config from environment variables in Rust

configuration error-handling generics
Intermediate 7 steps
typescript 
import { Module, Injectable } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import * as Joi from 'joi';
 

Validated, typed config in NestJS

configuration validation dependency-injection
Intermediate 6 steps