hello

arrayMethods.js

const names = ['Alex', 'John', 'Marie'];
const ages = [20, 30, 25];


const person = {
  name: '',
  age: 0,
}

const persons = [];
names.forEach((name, index) => {
	persons.push({
  	name,
    age: ages[index],
  })
});

const personsKeys = persons
  .map(({ name, age }) => `${name}:${age}`)

const agerageAge = ages.reduce((acc, age, index, array) => {
  
  return acc + age / array.length;
}, 0)
  
const personsMap = persons.reduce((acc, person) => {
  return {
    ...acc,
    [person.name]: person,
  }
}, {})

Object.entries(personsMap).forEach(([key, value]) => {
  console.log(key, value);
})

Object.keys(personsMap).forEach((key) => {
console.log(key, personsMap[key]);
})

console.log('includes', names.includes('Alex'))
console.log('some', persons.some((item) => item.name === 'Alex'))
console.log('every', persons.every((item) => item.age > 18))
console.log('find', persons.find((item) => item.name === 'Alex'))
console.log('findIndex', persons.findIndex((item) => item.name === 'Alex'))
console.log('filter', persons.filter((item) => item.age > 21))

// mutate
const array = [];
array.push()
array.sort()
array.revert()
array.splice()
array.pop()
...

const customSort = (persons) => {
//...
  return [...persons].sort();
}

const result = customSort(persons);
const average = persons.reduce();

console.log(persons);
console.log(agerageAge)
console.log(personsMap)