Code Explainers

Code explainers tagged #defaults

typescript 
import { Injectable, inject } from '@angular/core';
import { MatDialog } from '@angular/material/dialog';
import { Observable, of } from 'rxjs';
import { switchMap } from 'rxjs/operators';

A reusable confirmation dialog service in Angular

dependency-injection observables dialog
Intermediate 6 steps
go 
package handlers
 
import (
	"encoding/json"

Parsing search query params in a Go handler

http-handlers input-validation defaults
Intermediate 7 steps
python 
from configparser import ConfigParser, ExtendedInterpolation
from pathlib import Path
 
 

Layered INI config loading in Python

configuration parsing defaults
Intermediate 8 steps
go 
package config
 
import (
	"fmt"

Parsing timeout config in Go

configuration validation error-wrapping
Intermediate 7 steps
go 
package config
 
import (
	"fmt"

Loading and saving YAML config in Go

yaml struct-tags defaults
Intermediate 8 steps
rust 
use std::time::Duration;
 
#[derive(Debug, Clone)]
pub struct ServerConfig {

The builder pattern in Rust

builder-pattern ownership error-handling
Intermediate 8 steps
go 
package config
 
import (
	"fmt"

Loading typed config from environment variables in Go

configuration environment-variables type-parsing
Beginner 8 steps
go 
package config
 
import (
	"encoding/json"

Parsing untyped JSON config in Go

json parsing type assertions error handling
Intermediate 7 steps
javascript 
function getCityName(user) {
  return user?.address?.city ?? "Unknown city";
}
 

Optional chaining and nullish coalescing in JS

optional-chaining nullish-coalescing defensive-coding
Intermediate 5 steps