TypeScript Type Inference

Introduction

Example

1/* this uses inference */
2let greeting = "Hello World"; // TypeScript knows this is a string
3
4// greeting = 42; // This causes a massive error!

Key Points

• "Inference" means guessing automatically.
• It saves time and keeps the code clean.
• It still locks the type permanently after guessing.
• You only explicitly write types when you don't assign an initial value.