reduce.js

'use strict'
// Example array
const numsArray = [0, 1, 2, 3, 4]

// Find the sum of all elements in an array using anonymous arrow function
const sum = numsArray.reduce((prev, curr) => prev + curr)

// Find the sum of all elements in an array using named arrow function
const add = (prev, curr) => {
  return prev + curr
}
sum = numsArray.reduce(add)

// Find the largest of all elements in an array using anonymous arrow function
let largest = numsArray.reduce((prev, curr) => prev > curr ? prev : curr)

// Find the largest of all elements in an array using named arrow function
const max = (prev, curr) => {
  return prev > curr ? prev : curr
}
largest = numsArray.reduce(max)

// Find the total number of rockets launched in an array
// using anonymous arrow function
// start the count with 0
const rockets = [
    { country: 'Russia', launches: 32 },
    { country: 'US', launches: 23 },
    { country: 'China', launches: 16 },
    { country: 'Europe(ESA)', launches: 7 },
    { country: 'India', launches: 4 },
    { country: 'Japan', launches: 3 }
]
rockets.reduce((prev, curr) => {
  return prev + curr.launches
}, 0)