filter.js

'use strict'

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

// Filter for odd elements in an array using predicate function
const isOdd = (num) => {
  return num % 2
}
odds = numsArray.filter(isOdd)

// Filter for odd elements in an array using anonymous arrow function
const odds = numsArray.filter(num => { return num % 2 })

// Filter for only countries that launched 20+ rockets
// using a predicate function
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 }
]
const isAggressive = rocket => { return rocket.launches >= 20 }
const aggressiveCountries = rockets.filter(isAggressive)