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This article is about how TypeScript uses type inference. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Skillful use of type derivation

TypeScript can infer (check) the types of variables according to some simple rules.

For example, a simple add function

Function add (a: number, b: number) {return a + b}

TypeScript can derive the return value of the function from the operator of the parameter and return.

If you want to get the type of the function as a whole, you can use typeof

Pay attention to distinguish it from the typeof in JavaScript

Type AddFn = typeof add

Of course, the above situation is relatively simple. Sometimes our return value type is actually quite complex. At this time, we can easily get the return value type with the help of type derivation and ReturnType.

Type returnType = ReturnType / / number

The above techniques are very suitable for coding redux, so we can omit a lot of repetitive code. After all, the coding work of redux is very tedious.

Thank you for reading! This is the end of this article on "how to use type derivation in TypeScript". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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