typescript how to type a function code example
Example 1: typescript function type
function sayHello(name: string): string {
console.log(`Hello, ${name}`!);
}
sayHello('Bob');
Example 2: types function typescript
interface Easy_Fix_Solution {
title: string;
callback: Function;
}
Example 3: types function typescript
interface Alternate_Syntax_4_Advanced {
title: string;
callback<T extends unknown[], R = unknown>(...args?: T): R;
}
Example 4: types function typescript
interface Better_still_safe_but_way_more_flexible_fix {
title: string;
callback: <T = unknown, R = unknown>(args?: T) => R;
}
interface Alternate_Syntax_4_Better_still_safe_but_way_more_flexible_fix {
title: string;
callback<T = unknown, R = unknown>(args?: T): R;
}