Array functions

array.js

const arr = [1, 2, 3];

// Reduce to object
const obj = arr.reduce((all, item, index) => {
  // do something with item and all
  all[index] = item;
  
  // return all
  return all;
}, {});


// Map over arr
arr.map((item, index) => {
  // do something with this item
  functionCall(item);
});


// Filter arr
const newArr = arr.filter((item) => (item > 2));