omarkdev

class User {
    name: string = 'Marcos';

    changePassword(newPassword: string) { }
}

const user = new User();

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

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

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

omarkdev

const symbol1 = Symbol('Awesome');

symbol1.description;
// "Awesome"

omarkdev

const symbol1 = Symbol('Awesome');

symbol1.toString();
// "Symbol(Awesome)"

omarkdev

const message = '     Hello world!     ';

message.trimEnd();
// "     Hello world!"

message.trimStart();
// "Hello world!     "

omarkdev

const entries = [ ['name', 'Marcos'], ['site', 'omark.dev'], ['twitter', '@omarkdev'] ];

Object.fromEntries(entries);
// {name: "Marcos", site: "omark.dev", twitter: "@omarkdev"}

omarkdev

const arr1 = [1, 2, 3, 4];

const arr1FlattedMultipliedByTwo = arr1.flatMap(v => [ v * 2 ]);
// arr1FlattedMultipliedByTwo

omarkdev

const arr1 = ['a', 'b', , , , ['c', , 1, null, undefined, '', 0]];
const arr1Flatted = arr1.flat();

// ["a", "b", "c", 1, null, undefined, "", 0]

omarkdev

const arr1 = ['a', ['b', ['c']], 1, [2, [3, [4, [5]]]]];

const arr1Flatted1 = arr1.flat();
// ["a", "b", Array(1), 1, 2, Array(2)]

const arr1Flatted2 = arr1.flat(2);
// ["a", "b", "c", 1, 2, 3, Array(2)]

const arr1FlattedInfinity = arr1.flat(Infinity);
// ["a", "b", "c", 1, 2, 3, 4, 5]