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Frontend

TypeScript Declaration Files (.d.ts) and @types Packages

Learn how a TypeScript declaration file (.d.ts) works, how to install @types packages including scoped ones, and how to type untyped libraries with declare module and extend globals with declare global.

Sep 24, 20269 min read

Frontend

TypeScript Generics, Classes and Conditional Types

Learn TypeScript generics step by step: classes and access modifiers, generic functions and classes, constraints with keyof, conditional types, infer and recursive types, with TypeScript 5.x examples.

Sep 24, 202610 min read

Frontend

TypeScript Setup for Node.js with ts-node and nodemon

A step-by-step TypeScript setup for Node.js: install the compiler, configure tsconfig.json, run .ts files with ts-node, restart on save with nodemon, and write correct package.json scripts.

Sep 24, 20269 min read

Frontend

Mocking APIs with Cypress Intercept, Fixtures and Faker

Use cy.intercept with fixtures and @faker-js/faker factories to mock APIs in Cypress: match query strings, wait on aliases, log in by role, and assert on form data and file uploads.

Sep 24, 202610 min read

Frontend

Cypress Component Testing: Mount, Spy, Stub and Intercept

Set up Cypress component testing for React and Vite, mount components with cy.mount, verify callbacks with cy.spy, control return values with cy.stub, and mock API calls with cy.intercept.

Sep 24, 20269 min read

Frontend

Cypress Testing Library: Accessible Queries with findByRole

Set up Cypress Testing Library, follow the query priority that starts with findByRole, avoid test IDs, check accessible roles in DevTools, and handle key actions and file uploads.

Sep 24, 20269 min read

Frontend

Cypress E2E Testing: A Practical Guide for Cypress 13+

Learn Cypress E2E testing the practical way: test structure and Mocha hooks, assertions, should vs then retry-ability, wrap, its and invoke, custom commands, env vars and cy.request.

Sep 24, 202610 min read

Backend

Go Slices, Maps and Pointers: How Data Really Moves

A practical guide to Go slices, maps and pointers: arrays vs slices, len, cap and append, nil vs empty slices, map gotchas, and what pass by value really copies in Go 1.22+.

Sep 24, 202610 min read

Backend

Go Strings, Bytes and Runes: UTF-8 Text Done Right

Understand Go rune vs byte vs string: why len counts bytes, how UTF-8 and Thai text work, ranging over strings, strconv, strings.Builder, plus data types, const and iota.

Sep 24, 202610 min read

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