typescript declare function type code example
Example 1: typescript default parameter
sayHello(hello: string = 'hello') {
console.log(hello);
}
sayHello();
sayHello('world');
Example 2: types function typescript
interface Safer_Easy_Fix {
title: string;
callback: () => void;
}
interface Alternate_Syntax_4_Safer_Easy_Fix {
title: string;
callback(): void;
}
Example 3: typescript function type
function sayHello(name: string): string {
console.log(`Hello, ${name}`!);
}
sayHello('Bob');
Example 4: typescript function type
interface Date {
toString(): string;
setTime(time: number): number;
}
Example 5: types function typescript
interface Easy_Fix_Solution {
title: string;
callback: Function;
}
Example 6: types function typescript
interface Param {
title: string;
callback: function;
}