FCC-js-tutorial-part-05.js

/*
TODO : Basic Data Structures
*/
// !=> 5.1=>Use an Array to Store a Collection of Data
let yourArray = ['one', 7, 'three', true, false, undefined, null]; // Change this line

// !=> 5.2 => Access an Array's Contents Using Bracket Notation
let myArray = ["a", "b", "c", "d"];
myArray[1] = "e"//not b anymore;
console.log(myArray);

// !=> 5.3 => Add Items to an Array with push() and unshift()
function mixedNumbers(arr) {
    // Only change code below this line
    arr.unshift('I', 2, 'three');
    arr.push(7, 'VIII', 9)
    // Only change code above this line
    return arr;
}

console.log(mixedNumbers(['IV', 5, 'six']));

// !=> 5.4 => Remove Items from an Array with pop() and shift()
function popShift(arr) {
    let popped = arr.pop(); // Change this line
    let shifted = arr.shift(); // Change this line
    return [shifted, popped];
}

console.log(popShift(['challenge', 'is', 'not', 'complete']));

// !=> 5.5 => Remove Items Using splice()
const arr = [2, 4, 5, 1, 7, 5, 2, 1];
// Only change code below this line
arr.splice(1, 4)
// Only change code above this line
console.log(arr);

// !=> 5.6 => Add Items Using splice()
function htmlColorNames(arr) {
    // Only change code below this line
    const starIndex = 0
    const amountToDelete = 2
    arr.splice(starIndex, amountToDelete, 'DarkSalmon', 'BlanchedAlmond')
    // Only change code above this line
    return arr;
}

console.log(htmlColorNames(['DarkGoldenRod', 'WhiteSmoke', 'LavenderBlush', 'PaleTurquoise', 'FireBrick']));

// !=> 5.7 => Copy Array Items Using slice()
function forecast(arr) {
    // Only change code below this line

    return arr.slice(2, 4);
}

// Only change code above this line
console.log(forecast(['cold', 'rainy', 'warm', 'sunny', 'cool', 'thunderstorms']));

// !=> 5.8 => Copy an Array with the Spread Operator
function copyMachine(arr, num) {
    let newArr = [];
    while (num >= 1) {
        // Only change code below this line
        newArr.push([...arr])
        // Only change code above this line
        num--;
    }
    return newArr;
}

console.log(copyMachine([true, false, true], 2));

// !=> 5.9 => Combine Arrays with the Spread Operator
function spreadOut() {
    let fragment = ['to', 'code'];
    let sentence = ['learning', ...fragment, 'is', 'fun']; // Change this line
    return sentence;
}

console.log(spreadOut());

// !=> 5.10 => Check For The Presence of an Element With indexOf()
function quickCheck(arr, elem) {
    // Only change code below this line
    let idx = arr.indexOf(elem)
    if (idx >= 0) {
        return true
    }
    return false
    // Only change code above this line
}

console.log(quickCheck(['squash', 'onions', 'shallots'], 'mushrooms'));

// !=> 5.11 => Iterate Through All an Array's Items Using For Loops
function filteredArray(arr, elem) {
    let newArr = [];
    // Only change code below this line
    for (let i = 0; i < arr.length; i++) {
        if (arr[i].indexOf(elem) == -1) {
            newArr.push(arr[i])
        }
    }
    // Only change code above this line
    return newArr;
}

console.log(filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3));

// !=> 5.12 => Create complex multi-dimensional arrays
let myNestedArray = [
    // Only change code below this line
    ["unshift", false, 1, 2, 3, "complex", "nested"],
    ["loop", "shift", 6, 7, 1000, "method"],
    ["concat", false, true, "spread", "array", ["deep"]],
    ["mutate", 1327.98, "splice", "slice", "push", [["deeper"]]],
    ["iterate", 1.3849, 7, "8.4876", "arbitrary", "depth", [[["deepest"]]]]
    // Only change code above this line
];

// !=> 5.13 => Add Key-Value Pairs to JavaScript Objects
let foods = {
    apples: 25,
    oranges: 32,
    plums: 28
};

// Only change code below this line
foods['bananas'] = 13
foods['grapes'] = 35
foods['strawberries'] = 27
// Only change code above this line

console.log(foods);

// !=> 5.14 => Modify an Object Nested Within an Object
let userActivity = {
    id: 23894201352,
    date: 'January 1, 2017',
    data: {
        totalUsers: 51,
        online: 42
    }
};

// Only change code below this line
userActivity.data.online = 45
// Only change code above this line

console.log(userActivity);

// !=> 5.15 => Access Property Names with Bracket Notation
let foods = {
    apples: 25,
    oranges: 32,
    plums: 28,
    bananas: 13,
    grapes: 35,
    strawberries: 27
};

function checkInventory(scannedItem) {
    // Only change code below this line
    return foods[scannedItem]
    // Only change code above this line
}

console.log(checkInventory("apples"));

// !=> 5.16 => Use the delete Keyword to Remove Object Properties
let foods = {
    apples: 25,
    oranges: 32,
    plums: 28,
    bananas: 13,
    grapes: 35,
    strawberries: 27
};

// Only change code below this line
delete foods.oranges
delete foods.plums
delete foods.strawberries
// Only change code above this line

console.log(foods);

// !=> 5.17 => Check if an Object has a Property
let users = {
    Alan: {
        age: 27,
        online: true
    },
    Jeff: {
        age: 32,
        online: true
    },
    Sarah: {
        age: 48,
        online: true
    },
    Ryan: {
        age: 19,
        online: true
    }
};

function isEveryoneHere(userObj) {
    // Only change code below this line
    if (
        userObj.hasOwnProperty('Alan') &&
        userObj.hasOwnProperty('Jeff') &&
        userObj.hasOwnProperty('Sarah') &&
        userObj.hasOwnProperty('Ryan')
    ) {
        return true
    } return false
    // Only change code above this line
}

console.log(isEveryoneHere(users));

// !=> 5.18 => Iterate Through the Keys of an Object with a for...in Statement
const users = {
    Alan: {
        online: false
    },
    Jeff: {
        online: true
    },
    Sarah: {
        online: false
    }
}

function countOnline(usersObj) {
    // Only change code below this line
    let btn = 0
    for (let user in usersObj) {
        if (usersObj[user].online === true) {
            btn += 1
        }
    }
    return btn
    // Only change code above this line
}

console.log(countOnline(users));

// !=> 5.19 => Generate an Array of All Object Keys with Object.keys()
let users = {
    Alan: {
        age: 27,
        online: false
    },
    Jeff: {
        age: 32,
        online: true
    },
    Sarah: {
        age: 48,
        online: false
    },
    Ryan: {
        age: 19,
        online: true
    }
};

function getArrayOfUsers(obj) {
    // Only change code below this line
    return Object.keys(obj)
    // Only change code above this line
}

console.log(getArrayOfUsers(users));

// !=> 5.20 => Modify an Array Stored in an Object
let user = {
    name: 'Kenneth',
    age: 28,
    data: {
        username: 'kennethCodesAllDay',
        joinDate: 'March 26, 2016',
        organization: 'freeCodeCamp',
        friends: [
            'Sam',
            'Kira',
            'Tomo'
        ],
        location: {
            city: 'San Francisco',
            state: 'CA',
            country: 'USA'
        }
    }
};

function addFriend(userObj, friend) {
    // Only change code below this line
    userObj.data.friends.push(friend)
    return userObj.data.friends
    // Only change code above this line
}

console.log(addFriend(user, 'Pete'));