Beginner LevelJavaScript & TypeScript
What is TypeScript and how does static typing differ from dynamic typing?
❓ Interview Prompt: Explain TypeScript as a typed superset of JavaScript, compile-time vs runtime checks, and developer tooling benefits.
TypeScript is a typed syntactic superset of JavaScript that compiles down to plain JavaScript.
Dynamic (JavaScript) vs Static (TypeScript) Typing:
•
Dynamic Typing (JS): Types are associated with values, not variables. Type errors occur at runtime when code executes in production.
•
Static Typing (TS): Types are verified at compile-time. Type mismatches and missing properties trigger immediate compiler errors in your editor.
Key Benefits:
1
Catches bugs early (null checks, typo properties, invalid arguments).
2
Supercharges IDE autocomplete, refactoring, and inline documentation.
3
Serves as self-documenting code contracts across teams.
Code Implementation Example
typescript
interface User {
id: number;
name: string;
email?: string; // Optional property
}
function formatUser(user: User): string {
return `User #${user.id}: ${user.name.toUpperCase()}`;
}
// ✅ Valid call
formatUser({ id: 1, name: 'Alice' });
// ❌ TypeScript Compile Error: Argument of type '{ id: string; }' is not assignable
// formatUser({ id: "one", name: "Bob" });💡TypeScript interface contracts preventing runtime type errors at compile time.
🎯 Interview Key Takeaway
TypeScript adds compile-time static type checking to JavaScript, catching errors before code runs in production.
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