/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

2 votes182 views3 answers
Getserversideprops
TypeScript
0 vote199 views1 answer
Angular redirect on submit
TypeScript
0 vote188 views1 answer
Collection that accepts duplicate keys
TypeScript
0 vote273 views1 answer
Latest unity version that supports 32 bit
TypeScript
0 vote188 views1 answer
Omgsmhwthwhyomgnvm
TypeScript
3 votes209 views2 answers
Adonis load relationship
TypeScript
11 votes297 views4 answers
If a class exists jquery
TypeScript
0 vote182 views1 answer
Loading assets in ionic react
TypeScript
1 vote209 views3 answers
Check null typescript
TypeScript
2 votes221 views1 answer
Three dots icon flutter
TypeScript