JAVASCRIPT

console.time js

console.time();
for (i = 0; i < 100000; i++) {
  // some code
}
console.timeEnd();

console time

console.time();   // Begin timer
// Run code
console.timeEnd();   // End timer and output time

console.time

console.time("answer time");
alert("Click to continue");
console.timeLog("answer time");
alert("Do a bunch of other stuff...");
console.timeEnd("answer time");

console.time

console.time('factorial');

const number = 10;
let result = 1;
for (let i = 1; i <= number; i++) {
    result *= i;
    console.timeLog('factorial');
}

console.log('factorial result', result);
console.timeEnd('factorial');

console.time

const heroes = [
    { name: 'Spiderman', universe: 'Marvel' },
    { name: 'Iron Man', universe: 'Marvel' },
    { name: 'Hulk', universe: 'Marvel' },
    { name: 'Batman', universe: 'DC' },
    { name: 'Superman', universe: 'DC' },
    { name: 'Wonder Woman', universe: 'DC' },
]

const marvel = heroes.filter(h => h.universe === 'Marvel');

console.table(marvel);

console.time

const heroes = [
    {
        name: 'Spiderman',
        firstName: 'Peter',
        lastName: 'Parker',
        city: 'New York City'
    }, {
        name: 'Iron Man',
        firstName: 'Tony',
        lastName: 'Stark',
        city: 'New York City'
    }];

console.table(heroes);

console.time

let batman = { name: 'Batman' };
// batman.firstName = "Bruce";
// batman.lastName = "Wayne";
console.log(batman);

batman = { ...batman, firstName: 'Bruce', lastName: 'Wayne' };
console.log(batman);

console.time

let heroes = [
    ['Superman', 'Batman', 'Wonderwoman'],
    ['Spiderman', 'Iron Man', 'Hulk']
]

console.log(heroes.flat());

console.time

const numbers = [2, 4, 6, 8];
const multi = numbers.map(n => n * n);
console.log('numbers', multi);