MEDIUM BLOG POST - Javascript’s 3 Major Paradigms: The Five tenets of Functional Programming [part 3 of 4]

2-functionsal-composition-how.js

const vehicles = [
 { make: ‘Honda’, model: ‘CR-V’, type: ‘suv’, price: 24045 },
 { make: ‘Honda’, model: ‘Accord’, type: ‘sedan’, price: 22455 },
 { make: ‘Mazda’, model: ‘Mazda 6’, type: ‘sedan’, price: 24195 },
 { make: ‘Mazda’, model: ‘CX-9’, type: ‘suv’, price: 31520 },
 { make: ‘Toyota’, model: ‘4Runner’, type: ‘suv’, price: 34210 },
 { make: ‘Toyota’, model: ‘Sequoia’, type: ‘suv’, price: 45560 },
 { make: ‘Toyota’, model: ‘Tacoma’, type: ‘truck’, price: 24320 },
 { make: ‘Ford’, model: ‘F-150’, type: ‘truck’, price: 27110 },
 { make: ‘Ford’, model: ‘Fusion’, type: ‘sedan’, price: 22120 },
 { make: ‘Ford’, model: ‘Explorer’, type: ‘suv’, price: 31660 }
];
const Makes=(arr,make)=>arr.filter(x=>x.make===make)
const CarType=(arr,type)=>arr.filter(x=>x.type===type)
let ArrayOfAllFords=Makes(vehicles,”Fords”) 
let ArrayOfAllFordTrucks=Makes(vehicles,”trucks”)
//OUTPUTS
// ArrayOfAllFords is => [{ make: ‘Ford’, model: ‘F-150’, type: ‘truck’, price: 27110 }, { make: ‘Ford’, model: ‘Fusion’, type: ‘sedan’, price: 22120 }, { make: ‘Ford’, model: ‘Explorer’, type: ‘suv’, price: 31660 }]
//ArrayOfAllFordTrucks is => [{ make: ‘Ford’, model: ‘F-150’, type: ‘truck’, price: 27110 }]