codeup-web-exercises/MapFilterReduceBonus.html at master · liliwang1/codeup-web-exercises · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    // https://java.codeup.com/extra-exercises/javascript/map-filter-reduce/
    'use strict';
    {
        const fruits = ["cantaloupe", "orange", "date", "elderberry", "ugli fruit", "pineapple"];

        const customers = [
            {
                name: "Fred",
                age: 58,
                occupation: "Police Officer",
                noOfPurchases: 4
            },
            {
                name: "Samantha",
                age: 54,
                occupation: "Teacher",
                noOfPurchases: 18
            },
            {
                name: "Charles",
                age: 38,
                occupation: "Librarian",
                noOfPurchases: 9
            }
        ];

        const pets = [
            {
                name: 'Bud',
                age: 2,
                breed: 'Pug'
            },
            {
                name: 'Gabby',
                age: 10,
                breed: 'Retriever'
            },
            {
                name: 'Fred',
                age: 1,
                breed: 'Lab'
            },
            {
                name: 'Bowser',
                age: 2,
                breed: 'Pug'
            }
        ];

        const family = [
            {
                name: "Pam",
                gender: "female",
                age: 29,
            },
            {
                name: "Amelie",
                gender: "female",
                age: 10,
            },
            {
                name: "Justin",
                gender: "male",
                age: 32,
            },
        ];
        // Use map, filter, and reduce to:
        // 1 Create an array of the first letters of each fruit
        const firstLetterArr = fruits.map(fruit => fruit.charAt(0));
        // 2 Create array of user objects based on the customers array of objects (each user object should just have name and age properties)
        const userObjArr = customers.map(({name, age}) => ({name, age}));
        // 3 Create an array of civil servant customers (teachers and police officers) containing the same properties as the objects on the customers objects
        const civilServantCustomers = customers.filter(customer => customer.occupation !== 'Librarian');
        const civilServantCustomers1 = customers.filter(({occupation}) => occupation === 'Police Officer' || occupation === 'Teacher');
        // 4 Determine the average age of all the customers
        const averageAge = customers.reduce((acc, customer) => acc + customer.age, 0) / customers.length;
        // 5 Create a function makeSuperPet() that takes in the pets array as input and returns a single pet object with the following shape...
        // {
        //     name: ALL_PET_NAMES_CONCATENATED_INTO_A_SINGLE_STRING,
        //         age: THE_TOTAL_OF_ALL_PET_AGES,
        //     breed: THE_FIRST_LETTERS_OF_ALL_PET_BREEDS_CONCATENATATED_INTO_A_SINGLE_STRING
        // }
        function makeSuperPet(arr) {
            const name = arr.reduce((acc, cur) => `${acc}${cur.name.charAt(0)}`, '');
            const age = arr.reduce((acc, cur) => acc + cur.age, 0);
            const breed = arr.reduce((acc, cur) => `${acc}${cur.breed.charAt(0)}`, '');
            return {
                name,
                age,
                breed
            };
        }

        // 6 Create a function that takes in an array of pets and returns an array of the length of first names for pugs only. Your output for the given input should be [3, 6] for 'Bud' and 'Bowser'
        function pugNameLength(arr) {
            return arr.filter(ele => ele.breed === 'Pug').map(ele => ele.name.length);
        }

        // 7 Create a function getFemaleFamilyMembers() that when given the family variable as an argument, returns an array of female family member names
        function getFemaleFamilyMembers(arr) {
            return arr.filter(ele => ele.gender === 'female').map(ele => ele.name);
        }

        // 8 Create a function makeLongPetString() that when given the variable of pets, returns a string of all property values with dashes separating each property value
        function makeLongPetString(arr) {
            return arr.reduce((acc, {name, age, breed}) => `${acc}-${name}-${age}-${breed}`, '').slice(1);
        }

        // 9 Create a function that when given an array of first names, returns an array of the same names with a last name of Smith
// input = ['Sally', 'Fred', 'Steve']
// output = ['Sally Smith', 'Fred Smith', 'Steve']
        function lNameSmith(arr) {
            return arr.map(ele => `${ele} Smith`);
        }

//         10 Create a function that when given an array of numbers, return the sum of the even numbers
        function evenNumSum(arr) {
            return arr.filter(ele => ele % 2 === 0).reduce((acc, cur) => acc + cur);
        }

//         11 Create a function that when given an array of numbers, return the sum of all numbers evenly divisible by 10
        function tenDivisibleSum(arr) {
            // arr.reduce((acc, cur) => {
            //     if (cur % 10 === 0) return acc + cur;
            //     else return acc;
            // }, 0)
            // arr.reduce((acc, cur) => {
            //     console.log(acc, cur);
            //     return cur % 10 === 0 ? acc + cur : acc;
            // }, 0)
            return arr.reduce((acc, cur) => cur % 10 === 0 ? acc + cur : acc, 0)
        }

//         12 Create a function that when given an array of names, return a string of all the first letters of each name
        function nameFistLetter(arr) {
            return arr.reduce((acc, cur) => `${acc}${cur.charAt(0)}`, '')
        }

//         13 Create a function that when given an array of values, returns an array of only the truthy values
        function truthyValues(arr) {
            return arr.filter(ele => ele);
            // arr.filter(ele => !!ele);
            // arr.reduce((acc, cur) => cur ? acc.concat(cur) : acc, []);
        }

//         14 Create a function that when given an object, returns the property values as an array of elements
        function valueArr(obj) {
            return Object.values(obj);
        }

        function valueArr1(obj) {
            return Object.keys(obj).map(ele => obj[ele]);
        }

//         15 Create a function that when given an object, returns the property names as an array of elements
        function propArr(obj) {
            return Object.keys(obj);
        }

        function propArr1(obj) {
            let result = [];
            for (prop in obj) {
                result.push(prop);
            }
            return result;
        }

        function propArr2(obj) {
            let result = [];
            for (let prop in obj) {
                result.push(prop);
            }
            return result;
        }

        function propArr3(obj) {
            let result = [];
            for (let key in obj) {
                result.push(key);
            }
            return result;
        }

//         16 Create a function that when given three arguments: a min num, a max num, an array of nums will return the array of nums that are only between the min and max values, inclusive
        function numArr(minNum, maxNum, arr) {
            return arr.filter(ele => ele >= minNum && ele <= maxNum);
        }

//         17 Create a function that when given an array of strings, returns an array of objects with properties for the given string value and the length of the string and the string without vowels (not including y)
        function newObj(arr) {
            return arr.map(ele => {
                let newObj = {};
                newObj.value = ele;
                newObj.length = ele.length;
                newObj.withoutVowels = ele.replace(/(a|e|i|o|u)/gi, '');
                return newObj;
            })
        }

        function newObj1(arr) {
            return arr.reduce((acc, ele) => {
                acc.push({
                    value: ele,
                    length: ele.length,
                    withoutVowels: ele.replace(/(a|e|i|o|u)/gi, '')
                });
                return acc;
            }, [])
        }

        function newObj2(arr) {
            return arr.reduce((acc, ele) => {
                return acc.concat({
                    value: ele,
                    length: ele.length,
                    withoutVowels: ele.replace(/(a|e|i|o|u)/gi, '')
                });
            }, [])
            // arr.reduce((acc, ele) => acc.concat({
            //     value: ele,
            //     length: ele.length,
            //     withoutVowels: ele.replace(/(a|e|i|o|u)/gi, '')
            // }), []);
        }

//         Given the following:
        const users = [
            {
                id: 1,
                name: 'ryan',
                email: 'ryan@codeup.com',
                languages: ['clojure', 'javascript'],
            },
            {
                id: 2,
                name: 'luis',
                email: 'luis@codeup.com',
                languages: ['java', 'scala', 'php'],
            },
            {
                id: 3,
                name: 'zach',
                email: 'zach@codeup.com',
                languages: ['javascript', 'bash'],
            },
            {
                id: 4,
                name: 'fernando',
                email: 'fernando@codeup.com',
                languages: ['java', 'php', 'sql'],
            },
            {
                id: 5,
                name: 'justin',
                email: 'justin@codeup.com',
                languages: ['html', 'css', 'javascript', 'php'],
            },
        ];
        // Use .reduce to transform the array into an object where the object's keys are ids and the values are objects that represent each user
        const newObj = users.reduce((acc, {id, name, email, languages}) => {
            acc[id] = {name, email, languages};
            return acc;
        }, {})
        // Use .reduce to get a unique list of the languages the codeup instructors know
        // From https://glitch.com/edit/#!/map-filter-reduce-practice

        /**
         * HINT: solve the map/filter/reduce problem with a foreach first
         */
// Reduce Problem #1
// given an array of names, use .reduce to produce a single string that contains everyone's name
        var names = ["Ben", "Jafar", "Matt", "Priya", "Brian"];
        const nameStr = names.reduce((acc, cur) => acc + cur);
        const nameStr1 = names.reduce((acc, cur) => acc + cur, '');
        const nameStr2 = names.reduce((acc, cur) => `${acc}${cur}`, '');
        const nameStr3 = names.reduce((acc, cur) => `${acc}${cur}`);
        var nameStr4 = '';
        names.forEach(name => nameStr4 += name)
// Reduce Problem #2: Sum up all of the numbers in the following array using .reduce
        let numbers = [1, 2, 3, 99, 1, -3, 1000, 0, 33, -67];
        const sum = numbers.reduce((acc, cur) => acc + cur);
// Reduce Problem #3:
// Given the above array of numbers, write the .reduce necessary to determine the highest number of the array.
        const highestNum = numbers.reduce((acc, cur) => acc >= cur ? acc : cur);
        const highestNum1 = Math.max.apply('e', numbers);
// Reduce problem #4:
// Given the above array of numbers, write the .reduce necessary to determine the lowest number of the array.
        const lowestNum = numbers.reduce((acc, cur) => acc <= cur ? acc : cur);
// Reduce problem #5:
// Given the array [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], use .reduce to determine the average of all the numbers
        const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
        const averageNum = arr.reduce((acc, cur) => acc + cur) / arr.length;
// Reduce problem #6, given the array of numbers from above, determine the average of all numbers
        const averageNum2 = numbers.reduce((acc, cur) => acc + cur) / numbers.length;

// Mapping problem #3
// Using .map to make a Projection
// Applying a function to a value and creating a new value is called a projection.
// each video object should  make a new object containing only the id and the title.
// Your output should be a variable called idAndTitleColleciton and look like
        /* [
        *  {"id": 70111470, "title": "Die Hard"},
        *  {"id": 654356453, "title": "Bad Boys},
        *  {"id": 65432445, "title": "The Chamber},
        *  etc...
        * ];
        */

        const idAndTitleColleciton1 = newReleases.map(ele => ({"id": ele.id, "title": ele.title}));
        const idAndTitleColleciton = newReleases.map(({id, title}) => ({id, title}));

        var newReleases = [
            {
                "id": 70111470,
                "title": "Die Hard",
                "boxart": "http://cdn-0.nflximg.com/images/2891/DieHard.jpg",
                "uri": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": [4.0],
                "bookmark": []
            },
            {
                "id": 654356453,
                "title": "Bad Boys",
                "boxart": "http://cdn-0.nflximg.com/images/2891/BadBoys.jpg",
                "uri": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": [5.0],
                "bookmark": [{id: 432534, time: 65876586}]
            },
            {
                "id": 65432445,
                "title": "The Chamber",
                "boxart": "http://cdn-0.nflximg.com/images/2891/TheChamber.jpg",
                "uri": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": [4.0],
                "bookmark": []
            },
            {
                "id": 675465,
                "title": "Fracture",
                "boxart": "http://cdn-0.nflximg.com/images/2891/Fracture.jpg",
                "uri": "http://api.netflix.com/catalog/titles/movies/70111470",
                "rating": [5.0],
                "bookmark": [{id: 432534, time: 65876586}]
            }
        ];


// Challenge:
// Define a function named allIndexesOf that takes in two arguments. The first argument should be the array to search and the second argument should be the value you want to search for. If the item does not exist in the provided array, return an empty array;
// Recommend using .filter or .reduce inside of your allIndexesOf function to find the index.
// HINT: If you know your output will be an array, use an empty array as your initial value
// Given:
// allIndexesOf(fruits, "apple") should return the array [0, 3]
// allIndexesOf(fruits, "guava") should return the array []
// allIndexesOf(fruits, "pineapple") should return [4]
        var fruits = ["apple", "banana", "orange", "apple", "pineapple"];

        function allIndexesOf(arr, value) {
            return arr.reduce((acc, ele, i) => ele === value ? acc.concat(i) : acc, []);
        }

        function allIndexesOf1(arr, value) {
            return arr.map((e, i) => e === value ? i : -1).filter(ele => ele !== -1);
        }

// Challenge:
// Define a function named removeAll(array, value) that takes in two arguments. The first argument should be an array and the second argument should be a value you wish to
// Given:
        var bugs = ["mosquito", "ant", "scorpion", "ant", "ant", "mosquito", "typo", "reference error", "type error"];

        function removeAll(arr, value) {
            return arr.filter(ele => ele !== value);
        }

// removeAll(bugs, "ant") should return ["mosquito", "scorpion", "mosquito", "typo", "reference error", "type error"]
// removeAll(bugs, "mosquito") should return ["ant", "scorpion", "ant", "ant", "typo", "reference error", "type error"]
// removeAll(bugs, "roach") should return the original array b/c "roach" has no occurrences.

        const fruits = ["cantaloupe", "orange", "date", "elderberry", "ugli fruit", "pineapple"];
        const customers = [
            {
                name: "Fred",
                age: 58,
                occupation: "Police Officer",
                noOfPurchases: 4
            },
            {
                name: "Samantha",
                age: 54,
                occupation: "Teacher",
                noOfPurchases: 18
            },
            {
                name: "Charles",
                age: 38,
                occupation: "Librarian",
                noOfPurchases: 9
            }
        ];

// PROBLEM 1 - create an array of the first letters of each fruit
        //HINT: use .map()
        const firstLetterFruits = fruits.map(ele => ele.charAt(0));
// PROBLEM 2 - create array of user objects based on the customers array of
        //objects (each user object should just have name and age properties)
        //HINT: use .map()
// PROBLEM 3 - create an array of civil servant customers (teachers and police
        //officers) containing the same properties as the objects on the
        //customers objects
        //HINT: use .filter()
        // PROBLEM 4 - determine the average age of customers
        //HINT: use .reduce()

        /* ---------------------------------------------------------------------- */
        // Given the following array...
        const names = ["John", "Max", "Ronald"];
        // complete the bonuses below...
        // - Create an array where all names are given a last name of Smith.
        const newArr = names.map(ele => `${ele} Smith`);
        // - Create an array where each word is in all caps
        const newArr1 = names.map(ele => ele.toUpperCase());
        // - Create an array where all names have more than 3 letters
        const newArr2 = names.filter(ele => ele.length > 3);
        // - Create an array of names with only the last two letters of each name
        const newArr3 = names.map(ele => ele.slice(-2));
        // - Create a total count of all letters
        const newArr4 = names.reduce((acc, cur) => acc + cur.length, 0);
        // - Create a string of all letters in alphabetical order
        const newStr = names.reduce((acc, cur) => acc + cur).toLowerCase().split('').sort().join('');
        // - Create an array of word objects with properties of wordLength, firstLetter, lastLetter
        const newArr5 = names.map(ele => ({
            wordLength: ele.length,
            firstLetter: ele.charAt(0),
            lastLetter: ele.slice(-1)
        }));
        // - Create a string of all vowels in the entire array of names
        const newStr1 = names.reduce((acc, cur) => acc + cur).replace(/[^aeiou]/gi, '');
        // - Create a single object with properties ???

        /* ---------------------------------------------------------------------- */
        // Given the following array...
        const family = [
            {
                name: "Karen",
                gender: "female",
                age: 29,
            },
            {
                name: "Summer",
                gender: "female",
                age: 10,
            },
            {
                name: "Bob",
                gender: "male",
                age: 32,
            },
        ];
        // complete the bonuses below...
        // - Calculate the average age of family members
        const averageAge = family.reduce((acc, {age}) => acc + age, 0) / family.length;
        // - Create an array of family objects without the age property
        const familyObj = family.map(({name, gender}) => ({name, gender}));
        const familyObj1 = family.map(e => ({name: e.name, gender: e.gender}));
        // - Create an array of all minors
        const minors = family.filter(ele => ele.age <= 18);
        // - Calculate the total age combined of family members
        const totalAge = family.reduce((acc, cur) => acc + cur.age, 0);
        // - Create an array of only female family member objects
        const femaleFamily = family.filter(ele => ele.gender === "female");
        const femaleFamily1 = family.filter(({gender}) => gender === "female");
        // - Create a single object with properties containing arrays of all names, genders, and ages
        const familyObject = family.reduce((acc, cur) => {
            acc.names.push(cur.name);
            acc.genders.push(cur.gender);
            acc.ages.push(cur.age);
            return acc;
        }, {names: [], genders: [], ages: []});
    }
</script>
</body>
</html>