/TypeScript/Typescript function as parameter

Typescript function as parameter

Typescript pass a function as an argunetn

class Foo {
    save(callback: (n: number) => any) : void {
        callback(42);
    }
}
var foo = new Foo();

var strCallback = (result: string) : void => {
    alert(result);
}
var numCallback = (result: number) : void => {
    alert(result.toString());
}

foo.save(strCallback); // not OK
foo.save(numCallback); // OK

Source: stackoverflow.com

Typescript function as parameter

function createPerson(name: string, doAction: () => void): void {
  console.log(`Hi, my name is ${name}.`);
  doAction(); // doAction as a function parameter.
}

// Hi, my name is Bob.
// performs doAction which is waveHands function.
createPerson('Bob', waveHands());

Typescript annotate return type

function add(x: number, y: number): number {
  return x + y;
}

Similar codes

4 votes141 views2 answers
From how many ways we can define props with typescript react
TypeScript
4 votes141 views2 answers
Import Entypo form vector icons
TypeScript
0 vote160 views1 answer
Test plan vs qa plan
TypeScript
6 votes132 views1 answer
TS define dictionary
TypeScript
1 vote266 views1 answer
Invalid formula - Operator ">=" doesn't support DATE >= TEXT. Operator ">=" supports ANY >= ANY
TypeScript
0 vote156 views1 answer
How to call a function in a macro with variadic arguments c++
TypeScript
0 vote148 views1 answer
How to get the table contents from a file in python
TypeScript
1 vote138 views1 answer
Material ui circular progress coor
TypeScript
0 vote144 views1 answer
Electron WebContents context-menu
TypeScript
0 vote152 views1 answer
Typescript export interface array
TypeScript