types function typescript
interface Safer_Easy_Fix {
title: string;
callback: () => void;
}
interface Alternate_Syntax_4_Safer_Easy_Fix {
title: string;
callback(): void;
}types function typescript
interface Safer_Easy_Fix {
title: string;
callback: () => void;
}
interface Alternate_Syntax_4_Safer_Easy_Fix {
title: string;
callback(): void;
}typescript function
// Parameter type annotation
function greet(name: string): string {
return name.toUpperCase();
}
console.log(greet("hello")); // HELLO
console.log(greet(1)); // error, name is typed (string)typescript function type
interface getUploadHandlerParams {
checker : Function
}get function return type typescript
type return_type = ReturnType<() => string>; // string
// or
function hello_world(): string {
return "hello world";
}
type return_type = ReturnType<typeof hello_world>; // stringtypescript function type
// define your parameter's type inside the parenthesis
// define your return type after the parenthesis
function sayHello(name: string): string {
console.log(`Hello, ${name}`!);
}
sayHello('Bob'); // Hello, Bob!typescript function type
interface Date {
toString(): string;
setTime(time: number): number;
// ...
}Copyright © 2021 Codeinu
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