/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

1 vote201 views1 answer
Ract import image
TypeScript
4 votes218 views2 answers
Command line arguments in java
TypeScript
1 vote233 views1 answer
Import exec ts
TypeScript
1 vote211 views1 answer
Why are my component bindings undefined in its controller?
TypeScript
0 vote223 views2 answers
Android java loop through all objects in layout
TypeScript
0 vote214 views1 answer
Alternative for .include in typescript
TypeScript
2 votes217 views2 answers
How to check constraints on a table in sql oracle
TypeScript
0 vote240 views4 answers
C++ sort vector of objects by property
TypeScript
11 votes215 views2 answers
React tsx component example
TypeScript
0 vote213 views1 answer
The eval() function
TypeScript