Type Assertions & Type Casting | Typescript Tutorial for Beginners
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Learn Type Assertions & Type Casting in this Typescript tutorial for beginners. Learn more about type assertions and type casting and complete a Typescript student challenge in detailed TS tutorial.
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Type Assertions & Type Casting | Typescript Tutorial for Beginners
(00:00) Intro
(00:05) Welcome
(00:28) Type Assertions vs Type Casting
(01:18) What are Type Assertions?
(01:58) Starter Code
(03:44) Converting Types with Assertions
(04:53) Angle Bracket Syntax instead of “as“
(05:55) Narrowing Return Values with Assertions
(08:37) Caution: Assertions allow mistakes!
(10:07) Double Casting and the unknown type
(12:03) DOM Selection Types
(16:19) Non-Null Assertions
(17:43) Angle Brackets and the DOM
(18:14) Student Challenge
(21:27) Solution 1: Beginners
(24:13) Solution 2: Type Assertion
Corrections:
(13:50) Syntax error: (’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.
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🔗 MDN - Static Typing:
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🔗 TS Type Assertions: #type-assertions
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