#defensive-coding code explainers

java

public static Map<String, String> parseCookieHeader(String header) {
    Map<String, String> cookies = new LinkedHashMap<>();
    if (header == null || header.isBlank()) {
        return cookies;

Parsing an HTTP Cookie header in Java

string-parsing http url-decoding

Intermediate 6 steps

javascript

import { notFound } from 'next/navigation';
 
const PER_PAGE = 24;
const SORT_OPTIONS = ['relevance', 'price-asc', 'price-desc', 'newest'];

Parsing search params in a Next.js page

input-validation query-params pagination

Intermediate 10 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