arrays-objects.js

//Arrays of Objects
// Efficiently combining and chaining Array methods and Arrow functions
// person.email.indexOf("@replicant.io") > -1
//Find the names of all the people who have "replicant.io" emails

let people = [
    {"id":123, "name":"Rick Deckard", "email":"rick@bladerunner.org"},
    {"id":456, "name":"Roy Batty", "email":"roy@replicant.io"},
    {"id":789, "name":"J.F. Sebastian", "email":"j.f@tyler.com"},
    {"id":258, "name":"Pris", "email":"pris@replicant.io"}
];

//Two step version
let replicants = people.filter(function(person){
   return person.email.indexOf("@replicant.io") > -1;
});
let names = replicants.map(function(person){
   return person.name; 
});
console.log("List of replicant names:", names);

//chain the two steps
let replicantNames = people.filter(function(person){
   return person.email.indexOf("@replicant.io") > -1;
}).map(function(person){
    return person.name;
});
console.log("List of replicant names:", replicantNames);

//arrow function version
let rn = people.filter( person => (person.email.indexOf("@replicant.io")>-1) )
.map(person => person.name );
console.log("List of replicant names:", rn);