Mastering TypeScript for Better Code Quality

TypeScript enhances JavaScript by adding type safety and tooling improvements.

Key Features

• Advanced Types: Record, Partial, Pick, and generics make your types more powerful.
• Type Guards: Narrow down unions and infer types automatically.
• Enums & Interfaces: Write clearer APIs and enforce contract rules.

Example

function logLength(input: string | string[]) {
  if (typeof input === 'string') {
    console.log(input.length);
  } else {
    console.log(input.join(', ').length);
  }
}

Conclusion

Mastering TypeScript improves code clarity, refactoring safety, and developer happiness.