Starting to Learn TypeScript

· 2 min read
typescriptjavascriptlearning

I’m starting to learn TypeScript, and it’s both confusing and exciting.

Why I’m Learning TypeScript

I keep running into bugs that TypeScript would catch:

  • Typos in property names
  • Passing wrong types to functions
  • Undefined errors that could be prevented

I’m tired of finding these bugs at runtime.

First Impressions

JSX feels weird: Writing types in my JavaScript feels strange at first.

The compiler is strict: It catches so many errors I didn’t know I was making.

Setup is confusing: tsconfig.json has so many options.

Basic Types I’m Learning

// Primitives
let name: string = "John";
let age: number = 25;
let isActive: boolean = true;

// Arrays
let numbers: number[] = [1, 2, 3];
let names: Array<string> = ["John", "Jane"];

// Objects
let user: { name: string; age: number } = {
  name: "John",
  age: 25
};

// Functions
function greet(name: string): string {
  return `Hello, ${name}`;
}

Interfaces

Interfaces help me define object shapes:

interface User {
  id: number;
  name: string;
  email: string;
  age?: number; // Optional property
}

const user: User = {
  id: 1,
  name: "John",
  email: "john@example.com"
};

What’s Confusing

Type inference: Sometimes TypeScript knows the type, sometimes I need to specify it.

Any type: I’m using any too much because I don’t know the proper type.

Generics: I see them everywhere but don’t understand them yet.

Type vs Interface: When do I use which?

Mistakes I’m Making

Using any everywhere: This defeats the purpose of TypeScript.

Fighting the compiler: When I get errors, I’m tempted to use any instead of fixing the types.

Not reading error messages: TypeScript errors are verbose but helpful.

What I’m Noticing

My editor (VS Code) is much more helpful now:

  • Better autocomplete
  • Catches errors as I type
  • Shows function signatures

My Plan

I’m converting one of my JavaScript projects to TypeScript to practice. It’s slow, but I’m learning a lot.

TypeScript feels like it will make me a better developer, even if it’s frustrating right now.

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