Break to Primitive Types
π¨βπΌ Excellent work! You now have a solid understanding of TypeScript's primitive
types.
You learned:
- π’ Numbers represent all numeric values in TypeScript
- π Strings hold text data and support template literals
- β Booleans are the foundation of conditional logic
- β Null and undefined represent absence of value in different ways
- π’ BigInt handles integers larger than
Number.MAX_SAFE_INTEGER - π Symbol creates unique identifiers that never collide
- β Truthy/falsy values convert into booleans for quick checks
π¦ A key insight: TypeScript's type inference often figures out types for you.
You don't always need to write
: number or : stringβTypeScript can infer
them from the values you assign.const age = 25 // TypeScript knows this is a number
const name = 'Alice' // TypeScript knows this is a string
But explicit types are valuable when:
- You want to document your intent
- TypeScript can't infer the type (like function parameters)
- You're declaring a variable without an initial value
Next up: Control flow - making decisions and repeating work!
Test Your Knowledge
Retrieval practice helps solidify learning by actively recalling information. Use this prompt with your AI assistant to quiz yourself on what you've learned.
Please quiz me on exercise 3 using the epicshop MCP server. Call the get_quiz_instructions tool with exerciseNumber "3" to get the quiz instructions, then quiz me one question at a time.