Senior JavaScript Things

closure.js

const person1 = {"name": "Michael", age: 25}
const person2 = {"name": "Kate", age: 23 }

function log() {
  console.log(this.name, this.age)
}

function bind(ctx, fn) {
  return function(...args) {
    fn.apply(context, args)
  }
}

promise.js

const sleep = sec => new Promise(resolve => setTimeout(() => resolve(sec), sec*1000))

sleep(3).then(sec => console.log(`Executed after ${sec} seconds`))

/* Promise.all([sleep(1), sleep(2), sleep(3)]).then(data => console.log(data)) */
/* Promise.race([sleep(1), sleep(2), sleep(3)]).then(data => console.log(data)) */

prototypes.js

/* Function injections to Object Global Class */
Object.prototype.keyslength = () => Object.keys(s).length 
Object.prototype.valueslength = () => Object.values(s).length 

/* Custom injections to custom object */
const keyslength = () => Object.keys(s).length
const valueslength = () => Object.values(s).length

let custom_object1 = Object.create(keyslength)
let custom_object2 = Object.create(valueslength)

this.js

const array = [1, 2, 3, 4, 5]

Array.prototype.mult(n) {
  return this.map((i) => {i * n})
}

array.multBy(3)