Understanding void in TypeScript: A Guide to the void Type Usage
What is “void” in TypeScript? A void in TypeScript is a type that represents the absence of a return value. It’s used as the return type for functions that do …
TypeScript Tutorial 2026: Types, Interfaces, Generics
TypeScript is JavaScript with optional static typing, it catches bugs at compile time, gives better autocomplete in editors, and is the modern standard for large React/Vue/Angular projects. This hub collects free TypeScript tutorials from “what is a type” through advanced generics, decorators, and full-stack TypeScript with Node.js back-ends.
What you’ll learn in the TypeScript tutorial series
Type basics: fundamental types, arrays, tuples, enums, union types
Interfaces: defining object shapes, extending interfaces, optional properties
Classes: access modifiers (public/private/protected), abstract classes, decorators
Generics: generic functions, generic classes, constraints
Type narrowing: type guards, discriminated unions, in operator
Utility types: Partial, Required, Pick, Omit, Record, ReturnType
Modules: import/export, declaration files (.d.ts), namespaces
Integration: TypeScript with React, Node.js, Express, Next.js
Why TypeScript matters for modern capstones
For BSIT capstones using React, Vue, Angular, or any modern JavaScript framework, TypeScript is now the default, it makes code more maintainable, catches errors before runtime, and signals professionalism to your panel. The learning curve from JavaScript is small (~1-2 weeks for the basics), and the payoff in code quality is significant. If your capstone is a pure PHP + MySQL system, TypeScript is optional. For anything React/Node.js-based, learn it.
TypeScript prerequisites
Before starting TypeScript, you should be comfortable with: (1) JavaScript fundamentals: variables, functions, arrays, objects (see our JavaScript Tutorial); (2) ES6+ features: arrow functions, destructuring, spread/rest; (3) npm basics: installing packages, package.json. TypeScript adds types on top of these, it doesn’t replace JavaScript knowledge.
Related TypeScript resources
JavaScript Tutorial, prerequisite foundation
React Projects, React + TypeScript is the modern combo
Node.js Projects, server-side TypeScript
Vue.js Projects, Vue 3 supports TypeScript natively
TypeScript Tutorials (full list), all individual tutorials
Scroll down to browse the full TypeScript tutorial catalog ↓
TypeScript readonly: How to use the TypeScript readonly?
What is TypeScript readonly? The Readonly utility type in TypeScript makes all properties of a type read-only, it simply means we cannot be reassigned after creation. Syntax: Let’s check out the example …
TypeScript Partial: How to use Partial Type TypeScript?
What is Partial in TypeScript? The partial utility type in TypeScript allows you to create a new type with all properties of the original type set as optional. It’s handy when you …
TypeScript Exclude: How to use Exclude in TypeScript?
What is TypeScript Exclude? The Exclude utility type in TypeScript is used to create a type by excluding certain types from another type. It’s like filtering out some types from …
TypeScript Record: How to use the Record Type in Typescript?
What is a TypeScript Record? The Record utility type in TypeScript allows you to create a new type with specified properties and their types. It’s useful when you want to …
A Complete Guide to Understand TypeScript Dictionary
TypeScript Dictionary A dictionary in TypeScript is a common data structure that lets you store data in key-value pairs. Unlike arrays that use numbers for indexing, dictionaries use keys which …
TypeScript Switch Case Statement: Complete Guide with Examples
What is the TypeScript Switch Statement The switch statement in TypeScript is a type of control flow statement that can be used to perform different actions based on different conditions. …
TypeScript Utility Types: 9 Utility Types You Should Learn in TS
Understanding the Utility Types in TypeScript TypeScript Utility Types represent a collection of generic types that TypeScript offers, enabling the transformation of one type into another. They form the backbone …
TypeScript Pick: Understanding the Pick keyword in TypeScript
What is TypeScript Pick? The Pick keyword in TypeScript is a utility type that allows you to create a new type by picking specific properties from an existing type. Syntax: …
TypeScript Omit: How to use the Omit keyword in TypeScript?
What is an omit keyword in TypeScript? So, what exactly is the Omit keyword in TypeScript? The Omit keyword in TypeScript is a utility type that lets you create a …
TypeScript Generics: How to use Generics in TypeScript?
Understanding TypeScript Generics So, what are Generics in TypeScript? TypeScript Generics is a tool that helps you write flexible code. It can handle many different data types while still keeping …
TypeScript forEach Loop: The Basics of forEach Method in TS
Understanding TypeScript forEach loop The forEach() loop in TypeScript is a method that is used to execute a certain function for each item in an array. The forEach method is …
TypeScript for loop: How to use for loop in TypeScript? Examples
What is TypeScript for loop? A for loop in TypeScript is a type of definite loop that has a control structure that lets you repeat a block of code a certain …
Frequently Asked Questions
What's the difference between TypeScript and JavaScript?
TypeScript is a superset of JavaScript, every valid JavaScript file is also valid TypeScript, but TypeScript adds optional static type annotations. Types are checked at compile time (catching bugs early), then stripped before the code runs as plain JavaScript. Browsers and Node.js don't execute TypeScript directly, you compile it first with
tsc or a bundler like Vite/webpack.Why use TypeScript instead of just JavaScript?
Three main benefits: (1) Catch errors at compile time: typos, wrong argument types, undefined property access show up before runtime. (2) Better autocomplete and refactoring in editors like VS Code, your IDE knows what every function returns and what shape every object has. (3) Self-documenting code: type annotations explain function signatures without comments. The tradeoff: more upfront syntax. For large projects, the tradeoff is always worth it.
Do I need TypeScript for a BSIT capstone?
It depends on your stack. React, Vue, or Angular capstones: TypeScript is increasingly the standard in 2026; use it. Node.js back-end: TypeScript is recommended for any project larger than a few files. Pure PHP + jQuery capstone: TypeScript adds nothing; skip it. Vanilla JS browser-only capstone: TypeScript is overkill; skip it. Use TypeScript when it adds value, not as a checkbox.
What are the most-used TypeScript features?
Basic types:
string, number, boolean, arrays (string[]), tuples. Interfaces: describing object shapes. Type aliases: naming complex types. Union types: string | number. Generics: type parameters for reusable functions like Array<T>. Utility types: Partial, Pick, Omit, Record. Type narrowing: using typeof and in guards. Master these and you cover ~80% of real-world TS usage.How do I set up TypeScript in a new project?
For a basic Node.js project:
npm init -y, then npm install -D typescript @types/node, then npx tsc --init to generate tsconfig.json. Compile with npx tsc. For React: use npm create vite@latest myapp -- --template react-ts, Vite sets up everything. For Next.js: npx create-next-app@latest --typescript. Modern frameworks include TypeScript templates by default, you almost never need to set it up manually.What's the difference between an interface and a type alias?
Both can describe object shapes. Interfaces can be reopened (declaration merging) and extended naturally, preferred for public APIs. Type aliases can describe anything (primitives, unions, intersections, tuples), preferred for complex non-object types. Rule of thumb: use
interface for object shapes, use type for unions, intersections, primitives, or anything that's not a simple object. In practice they're often interchangeable.