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Intro

Welcome

Type Assertions vs Type Casting

What are Type Assertions?

Starter Code

Converting Types with Assertions

Angle Bracket Syntax instead of "as"

Narrowing Return Values with Assertions

Caution: Assertions allow mistakes!

Double Casting and the unknown type

DOM Selection Types

Non-Null Assertions

Angle Brackets and the DOM

Student Challenge

Solution 1: Beginners

Solution 2: Type Assertion

13:50 Syntax error: document.getElementById'img' is what is needed if the element has an id set to "img". This does not change the concept I'm discussing. Just tired eyes and a syntax error.

Description:

Dive into a comprehensive tutorial on Type Assertions and Type Casting in TypeScript for beginners. Explore the differences between type assertions and type casting, learn how to convert types using assertions, and understand the angle bracket syntax. Discover techniques for narrowing return values, working with DOM selection types, and using non-null assertions. Complete a hands-on student challenge with two solution approaches. Gain valuable insights into TypeScript's type system and improve your coding skills through practical examples and explanations.

Type Assertions and Type Casting - Typescript Tutorial for Beginners

Dave Gray

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#Programming #Programming Languages #Javascript #Typescript