TypeScript Course || 6 Type Narrowing Techniques
Learn about Narrowing(Type Narrowing) from this video. We will discuss 6 ways to achieve Type Narrowing in TypeScript, with plenty of examples.
1) Narrowing: The "typeof" guard
2) Narrowing: With "Equality" operator
3) Narrowing: With "in" operator
4) Narrowing: The "instanceof" guard
5) Narrowing: With "Type Predicate" Function
6) Narrowing: "Discriminated Unions"
Not only that, we will also learn the elaborative use cases of concepts like Type Predicates and Discriminated Unions.
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Timecodes
0:00 - Introduction to Narrowing
00:20- Type Narrowing
03:30 - Narrowing Techniques
04:52 - Narrowing: The "typeof" guard
07:05 - Narrowing: typeof and truthiness
11:27 - Narrowing: With "Equality" operator
14:16 - Narrowing: With "in" operator
16:31 - Narrowing: The "instanceof" guard
22:12 - Type Predicate
25:59 - Narrowing: With "Type Predicate" Function
27:05 - Type Predicate use case
32:17 - Discriminated Unions
34:25 - Type Discriminant
35:33 - Narrowing: "Discriminated Unions"
37:54 - The End Notes
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Tapas Adhikary is an Educator at tapaScript, Tech enthusiast, Writer, YouTuber, and Open Source projects maintainer/contributor. He is a full-stack developer who has vast experience in building SaaS solutions. He is the founder of the ReactPlay platform, which is driven by open-source projects and a fast-growing community.
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