answers.js

// Array Helper Functions - ES6
// forEach() | map() | reduce() | filter() | every() | some() | find() | findIndex() | sort() | slice() | splice()

const characters = [
    {
        name: 'Luke Skywalker',
        height: 172,
        mass: 77,
        eye_color: 'blue',
        gender: 'male',
    },
    {
        name: 'Darth Vader',
        height: 202,
        mass: 136,
        eye_color: 'yellow',
        gender: 'male',
    },
    {
        name: 'Leia Organa',
        height: 150,
        mass: 49,
        eye_color: 'brown',
        gender: 'female',
    },
    {
        name: 'Anakin Skywalker',
        height: 188,
        mass: 84,
        eye_color: 'blue',
        gender: 'male',
    },
];

//***********
//*** MAP ***
//***********
//1. Get array of all names
const names = characters.map(function(character) { return character.name; });
console.log(names);

//2. Get array of all heights
const heights = characters.map(function(character) { return character.height; });
console.log(heights);

//3. Get array of objects with just name and height properties
const namesAndHeights = characters.map(function(character) { return {name: character.name, height: character.height}; });
console.log(namesAndHeights);

//4. Get array of all first names
const firstNames = characters.map(function(character) { return character.name.split(" ")[0]; });
console.log(firstNames);

//**************
//*** REDUCE ***
//**************
//1. Get total mass of all characters
const totalMass = characters.reduce(function(totalMass, character) { return totalMass + character.mass; }, 0);
console.log(totalMass);

//2. Get total height of all characters
var totalHeight = characters.reduce(function(totalHeight, character) { return totalHeight + character.height; }, 0);
console.log(totalHeight);

//3. Get total number of characters by eye color
var charactersEyeColors = characters.reduce(function(prev, character) { 
    if(character.eye_color in prev){
        prev[character.eye_color] += 1;
    } else {
        prev[character.eye_color] = 1;
    }
    return prev;
}, {});
console.log(charactersEyeColors);

//4. Get total number of characters in all the character names
var totalNumberOfChars = characters.reduce(function(prev, cur) { return prev + cur.name.length; }, 0);
console.log(totalNumberOfChars);

//**************
//*** FILTER ***
//**************
//1. Get characters with mass greater than 100
const charsMassGreater100 = characters.filter(function(character) { return character.mass > 100; });
console.log(charsMassGreater100);

//2. Get characters with height less than 200
const charsHeightLess200 = characters.filter(function(character) { return character.height < 200; });
console.log(charsHeightLess200);

//3. Get all male characters
const charactersMale = characters.filter(function(character) { return character.gender === 'male'; });
console.log(charactersMale);

//4. Get all female characters
const charactersFemale = characters.filter(function(character) { return character.gender === 'female'; });
console.log(charactersFemale);

//************
//*** SORT ***
//************
//1. Sort by mass
const sortByMass = characters.sort(function(char1, char2) { return char1.mass > char2.mass; });
console.log(sortByMass);

//2. Sort by height
const sortByHeight = characters.sort(function(char1, char2) { return char1.height > char2.height; });
console.log(sortByHeight);

//3. Sort by name
const sortByName = characters.sort(function(char1, char2) { return char1.name.toUpperCase() > char2.name.toUpperCase(); });
console.log(sortByName);

//4. Sort by gender
const sortByGender = characters.sort(function(char1, char2) { return char1.gender.toUpperCase() > char2.gender.toUpperCase(); });
console.log(sortByGender);

//*************
//*** EVERY ***
//*************
//1. Does every character have blue eyes?
const everyCharHasBlueEyes = characters.every(function(character) { return character.eye_color === 'blue'; });
console.log(everyCharHasBlueEyes);

//2. Does every character have mass more than 40?
const everyCharHasMassGreaterThan40 = characters.every(function(character) { return character.mass > 40; });
console.log(everyCharacterHasMassGreaterThan40);

//3. Is every character shorter than 200?
const everyCharShorterThan200 = characters.every(function(character) { return character.height < 200; });
console.log(everyCharShorterThan200);

//4. Is every character male?
const everyCharIsMale = characters.every(function(character) { return character.gender === 'male'; });
console.log(everyCharIsMale);

//************
//*** SOME ***
//************
//1. Is there at least one male character?
const atLeastOneMaleChar = characters.some(function(character) { return character.gender === 'male'; });
console.log(atLeastOneMaleChar);

//2. Is there at least one character with blue eyes?
const charWithBlueEyes = characters.some(function(character) { return character.eye_color === 'blue'; });
console.log(charWithBlueEyes);

//3. Is there at least one character taller than 210?
const charWithHeightGreaterThan210 = characters.some(function(character) { return character.height > 210; });
console.log(charWithHeightGreaterThan210);

//4. Is there at least one character that has mass less than 50?
const charWithMassLessThan50 = characters.some(function(character) { return character.mass < 50; });
console.log(charWithMassLessThan50);