Lesson
primitive-types
This lesson teaches Primitive types—the ideas, syntax, and habits you need before moving on in TypeScript.
Without a solid grasp of Primitive types, you will repeat mistakes in TypeScript exercises and on real pages or scripts.
You will apply Primitive types in contexts like: Modern front-end apps, Node APIs, and any team that standardizes on TS-first tooling.
Write TypeScript, compile in the browser, run the emitted JavaScript, and check understanding with MCQs.
Early in the track—complete this before layout, scripting, or architecture lessons that assume these basics.
Annotate primitives when it helps readers: string, number, boolean, bigint, symbol.
TypeScript often infers types from initializers—const count = 3 is number. Add explicit annotations at API boundaries and empty collections: const ids: string[] = [].
Challenge
name: string, age: number, active: boolean.Done when: terminal shows all three values in one line.
Can you explain this lesson in 30 seconds without reading notes?
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