fp.js

// Map, Filter, Reduce, FlatMap cheatsheet 🤑

const myArray = [
  {
    name: "Akash",
    age: 20
  },
  {
    name: "Sagar",
    age: 30
  },
  {
    name: "Madhav",
    age: 25
  }
]

// 1. map -- n -> n w/ operations
const mappedArray = myArray.map((element,index) => element.age * 2  )
console.log(mappedArray)

// 2. filter -- n -> <=n w/o operations
const filterFunc = element => element.age >= 25

const filteredArray = myArray.filter(filterFunc)
console.log(filteredArray)

// 3. reduce -- n -> 1 w/ operations
const reducedOutput = myArray.reduce((accumulator, element) => accumulator + element.age, 0);
console.log(reducedOutput)

// 4. flatMap -- n -> <=n w/ operations >= node 11.0.0
const a = [1,2,3,4]
const squareEvenArray = a.flatMap(element => element % 2 == 0 ? element * element : []);

console.log(squareEvenArray)