array_iteration2.js

// What you have
var officers = [
    { id: 20, name: 'Captain Piett' },
    { id: 24, name: 'General Veers' },
    { id: 56, name: 'Admiral Ozzel' },
    { id: 88, name: 'Commander Jerjerrod' }
  ];
  // What you need
 //[20, 24, 56, 88]
 console.log('--------------forEach-----------');

 var officersId=[];
 officers.forEach(function(officer){
officersId.push(officer.id);
 });
 console.log(officersId);
 console.log("=========================");

console.log('--------------map-----------');
 var officersId2=officers.map(function(officer){
     return officer.id;
 });
 console.log(officersId2);

 var officersId3=officers.map((officer)=>{
    return officer.id;
});
console.log(officersId3);

var officersId4=officers.map(officer=>officer.id);
console.log(officersId4);
console.log("=========================");

console.log('--------------reduce-----------');
var pilots = [
    {
      id: 10,
      name: "Poe Dameron",
      years: 14,
    },
    {
      id: 2,
      name: "Temmin 'Snap' Wexley",
      years: 30,
    },
    {
      id: 41,
      name: "Tallissan Lintra",
      years: 16,
    },
    {
      id: 99,
      name: "Ello Asty",
      years: 22,
    }
  ];

  var totalYears=pilots.reduce(function(accumulator,pilot){
      return accumulator+pilot.years;
  },0);
console.log("totalYears: " + totalYears);

var totalYears2=pilots.reduce((accumulator,pilot)=>accumulator+pilot.years,0);
console.log("totalYears2: " + totalYears2);

var mostExpPilot = pilots.reduce(function (oldest, pilot) {
    return (oldest.years || 0) > pilot.years ? oldest : pilot;
  }, {});
  console.log("mostExpPilot: " + mostExpPilot);

var oldest=pilots.reduce((oldest,pilot)=>oldest>pilot.years?oldest:pilot.years,0);
console.log("oldest: " + oldest);
console.log("=========================");


console.log('--------------filter-----------');

var pilots = [
    {
      id: 2,
      name: "Wedge Antilles",
      faction: "Rebels",
    },
    {
      id: 8,
      name: "Ciena Ree",
      faction: "Empire",
    },
    {
      id: 40,
      name: "Iden Versio",
      faction: "Empire",
    },
    {
      id: 66,
      name: "Thane Kyrell",
      faction: "Rebels",
    }
  ];

  var rebels=pilots.filter(pilot=>pilot.faction==="Rebels");
  console.log(rebels);

  var empires=pilots.filter(pilot=>pilot.faction==="Empire");
  console.log(empires);
console.log("=========================");

  console.log('--------------all-----------');

  var personnel = [
    {
      id: 5,
      name: "Luke Skywalker",
      pilotingScore: 98,
      shootingScore: 56,
      isForceUser: true,
    },
    {
      id: 82,
      name: "Sabine Wren",
      pilotingScore: 73,
      shootingScore: 99,
      isForceUser: false,
    },
    {
      id: 22,
      name: "Zeb Orellios",
      pilotingScore: 20,
      shootingScore: 59,
      isForceUser: false,
    },
    {
      id: 15,
      name: "Ezra Bridger",
      pilotingScore: 43,
      shootingScore: 67,
      isForceUser: true,
    },
    {
      id: 11,
      name: "Caleb Dume",
      pilotingScore: 71,
      shootingScore: 85,
      isForceUser: true,
    },
  ];

  var forceUser=personnel.filter(person=>person.isForceUser===true);
  console.log(forceUser);

  var score=forceUser.map(user=>user.pilotingScore+user.shootingScore);
  console.log("score: " + score);

  var forceUser2=personnel.filter(person=>person.isForceUser);
  console.log(forceUser2);

  var forceUser3=forceUser.map(user=>user);
  console.log(forceUser3);
console.log("=========================");

  var totalPilotingScore=personnel.reduce((total,person)=>total+person.pilotingScore,0);
  console.log("totalPilotingScore: " + totalPilotingScore);

  var totalShootingScore=personnel.reduce((total,person)=>total+person.shootingScore,0);
  console.log("totalShootingScore: " + totalShootingScore);

  var totalScore=personnel.reduce((total,person)=>total+person.pilotingScore+person.shootingScore,0);
  console.log("totalScore: " + totalScore);

  var forceUserScore=personnel
  .filter(person=>person.isForceUser)
  .map(jedi=>jedi.pilotingScore+jedi.shootingScore)
  .reduce((total,score)=>total+score,0);
  console.log("forceUserScore: " + forceUserScore);
console.log("=========================");

  var data = [
    {
      name: "Jan Dodonna",
      title: "General",
    },
    {
      name: "Gial Ackbar",
      title: "Admiral",
    },
  ];

  console.log(data.map(data1=>data1.title+' : '+data1.name));