contextual typing in typescript
Lets say you defined a call signature for any function.
type greet = (name: string) => void
Now, when you declare any function having this type, like this
const sayHello: greet = (name) =>{
console.log("hello ", name);
}
you dont need to explicitly annotate funciton paramters and return type,
this is called "CONTEXTUAL TYPING".Include Type TypeScript
// type a = Equal<'a' | 'a'>
type Equal<T, K> = K extends T ? true : false;
type Includes<T extends any[], K> = T extends [infer first, ...infer Rest]
? Equal<first, K> extends true
? true
: Includes<Rest, K>
: false;
type isPillarMen = Includes<['Kars', 'Esidisi', 'Wamuu', 'Santana'], 'Kars'>; // expected to be `false`typescript different types support
function getLength(obj: string | string[]) {
return obj.length;
}Copyright © 2021 Codeinu
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