typescript give fn variable to write on code example
Example 1: typescript default parameter
// Default Parameters
sayHello(hello: string = 'hello') {
console.log(hello);
}
sayHello(); // Prints 'hello'
sayHello('world'); // Prints 'world'
Example 2: 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());