omarkdev

const symbol1 = Symbol('Awesome');

symbol1.description;
// "Awesome"

omarkdev

try {
  throw new Error('Useless Error');
} catch {
  console.log('Ignoring the exception');
}
// Ignoring the exception

omarkdev

function /* Sum two numbers */ sum(a, b) {
  return a + b; // Sum a + b
}

sum.toString();
// "function /* Sum two numbers */ sum(a, b) {
//    return a + b; // Sum a + b
// }"

omarkdev

class User {
    name: string = 'Marcos';

    changePassword(newPassword: string) { }
}

const user = new User();

for (const key in user) {
    console.log(key);

omarkdev

function enumerable(newValue: boolean) {
    return (
        target: any,
        propertyKey: string,
        propertyDescriptor: PropertyDescriptor,
    ) => {
        propertyDescriptor.enumerable = newValue;
    }
}

omarkdev

function enumerable(newValue: boolean) {
    return (
        target: any,
        propertyKey: string,
        propertyDescriptor: PropertyDescriptor,
    ) => {
        propertyDescriptor.enumerable = newValue;
    }
}
class User {

omarkdev

function enumerable(newValue: boolean) {
    return (
        target: any,
        propertyKey: string,
        propertyDescriptor: PropertyDescriptor,
    ) => {
        propertyDescriptor.enumerable = newValue;
    }
}
class User {

omarkdev

function showInfo() {
    return (
        target: any,
        propertyKey: string,
        parameterIndex: number,
    ) => {
        console.log('target', target);
        console.log('property key', propertyKey);
        console.log('parameter index', parameterIndex);
    }

omarkdev

const firstWay = !! 'works';
const secondWay = Boolean('works');
const thirdWay = new Boolean('works');

if (firstWay == true) {
    console.log('First way really works!');
}

if (secondWay == true) {
    console.log('Second way really works!');

omarkdev

const firstWay = !! 'secret';
const secondWay = Boolean('secret');
const thirdWay = new Boolean('secret');

console.log(typeof firstWay);
console.log(typeof secondWay);
console.log(typeof thirdWay);

// boolean
// boolean