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typescript default parameter

By LockenessLockeness on Nov 11, 2020 
// Default Parameters
sayHello(hello: string = 'hello') { 
    console.log(hello); 
}

sayHello(); // Prints 'hello'

sayHello('world'); // Prints 'world'

Source: medium.com

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9

typescript parameter function type

By BiG WillarDBiG WillarD on Sep 08, 2020 
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

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3

typescript function as parameter

By peachmangopiepeachmangopie on Dec 03, 2020 
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());

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1

typescript default parameter

By Good GnuGood Gnu on Aug 27, 2020 
function sayName({ first, last = 'Smith' }: {first: string; last?: string }): void {
  const name = first + ' ' + last;
  console.log(name);
}

sayName({ first: 'Bob' });

Source: stackoverflow.com

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2

typescript function type

By peachmangopiepeachmangopie on Dec 03, 2020 
// define your parameter's type inside the parenthesis
// define your return type after the parenthesis

function sayHello(name: string): string  {
  console.log(`Hello, ${name}`!);
}

sayHello('Bob'); // Hello, Bob!

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3

typescript annotate return type

By Impossible IbexImpossible Ibex on Jun 01, 2020 
function add(x: number, y: number): number {
  return x + y;
}

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0

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