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Understand the types. Trust your code.
Stop guessing what a type error means. Learn how to describe your data and use feedback from TypeScript to write clearer JavaScript applications.
Check availabilityOne-to-one lessons: $15 USD per hour. Packages from $60. Start with a free trial.
See lesson optionstype Student = { name: string; score: number };
const passed = (student: Student) =>
student.score >= 50;The type tells us what the function expects. In a lesson, we try an invalid input and explain the error.
Add types to a small JavaScript app so its inputs, functions and data agree with each other.

I’m Zain. Bring your questions, including the ones you think you should already know. We’ll work at a pace that lets you understand the answer.
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$15 USD per hour
Live lessons with Zain, focused on the topics or code you bring. Ask questions and practise together.
Arrange my free trialOne tutor. Your goals. Every lesson is live, one to one and one hour long.
$60 USD total
$15 per one-hour lesson
Ask about 4 lessons$120 USD total
$15 per one-hour lesson
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$15 per one-hour lesson
Ask about 12 lessons$240 USD total
$15 per one-hour lesson
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