codeup-web-exercises/map-filter-reduce-lecture.html at main · Nathan-Haustveit/codeup-web-exercises · GitHub

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

<h1>Functional Methods</h1>

<main>
    <section>
        <h2>My Cats Names </h2>
        <ul id="myCats"></ul>
    </section>

    <section>
        <h2>Cat with Short Names</h2>
        <ul id="shortNamesCats"></ul>
    </section>
</main>


<script>
    "use strict";

    // Array of numbers someone likes for some reason
    const favoriteNumbers = [11, 17, 15, 12, 100, 7, 1, 3, 9, 50,52, 44, 13, 19];

    const myCats = ['Little One', "Mao Mao", "Lizzy"]

    const arrayOfTVShows = [
        {
            title: "The Office",
            seasons: 9,
            imdbScore: 9,
            firstEpisodeYear: 2005,
            characters: ["Micheal", "Pam", "Jim", "Andy"]
        },
        {
            title: "Game of Thrones",
            seasons: 8,
            imdbScore: 9.3,
            firstEpisodeYear: 2011,
            characters: ["Jon", "Arya", "Sansa", "Tyrion"]
        },
        {
            title: "The Good Place",
            seasons: 4,
            imdbScore: 8.2,
            firstEpisodeYear: 2016,
            characters: ["Janet", "Chidi", "Elenor", "Jason", "Tahani"]
        },
        {
            title: "Breaking Bad",
            seasons: 5,
            imdbScore: 9.5,
            firstEpisodeYear: 2008,
            characters: ["Walter", "Jesse", "Skylar"]
        },
    ]

    // MAP

    // TODO: double each number in the favorite numbers array.

    const doubleNumbersArray = favoriteNumbers.map((number) => number*2);

    console.log("doubleNumbersArray:", doubleNumbersArray)
    console.log("favoriteNumbers:", favoriteNumbers)


    // You could use forEAch to solve the same problem in another way. Although the syntax is longer in many cases
    const forEachExample = [];
    favoriteNumbers.forEach((element) =>  {
        forEachExample.push(element *2)
    })

    console.log("forEachExample:", forEachExample)

    const uppercaseCats = myCats.map((element) => element.toUpperCase())

    console.log("uppercaseCats:", uppercaseCats)

    // This is easily reusable in other map functions
    const mapElementToLI = (element) => `<li>${element}</li>`

    const uppercaseCatsHTML = uppercaseCats.map(mapElementToLI)

    console.log("uppercaseCatsHTML:", uppercaseCatsHTML)


    document.getElementById("myCats").innerHTML = uppercaseCatsHTML.join("")

    //TODO: create a headline that could be accessed later. using the title, seasons and imdbScore

    const mapHeadlineToArray =  (show) => {
        const { title, seasons, imdbScore }  = show

        return {
            ...show, // spread operator, allows you to get all the properties from show and display them in resulted object
            headline: `${title} (${seasons} seasons) has an average IMDB score of ${imdbScore}`
        }
    }
    const headlineTVShows = arrayOfTVShows.map(mapHeadlineToArray);

    console.log("headlineTVShows:", headlineTVShows)


    // FILTER

    // TODO: Get only the odd numbers from the favorite numbers array

    const oddFavorites = favoriteNumbers.filter((number) => number % 2)

    console.log("oddFavorites:", oddFavorites)

    // TODO: From the cats array I want to only get the cats that have a name of 7 or
    //  less characters.

    // You can separate the callback function from the filter if needed for readability or otherwise
    const filterCatsUnder7Characters = (cat) => cat.length < 10
    const catsWithShortNames = myCats.filter(filterCatsUnder7Characters);

    console.log("catsWithShortNames:", catsWithShortNames)

    // TODO: Combine the tools!
    // TODO: take the cats array that you returned from the filter above and map it to the page.

    const catsWithShortNamesHTML = myCats.filter(filterCatsUnder7Characters).map(mapElementToLI)

    console.log("catsWithShortNamesHTML:", catsWithShortNamesHTML)

    document.getElementById("shortNamesCats").innerHTML = catsWithShortNamesHTML.join("");


    // TODO: Filter the movies array such that it would return items 9 or over on the
    //  imdb rating scale and the show is created after or equal to 2008

    // This item filters on two values, you can of course do more if you needed it
    const bestShow = arrayOfTVShows.filter((show) => show.imdbScore >= 9 && show.firstEpisodeYear >= 2008)

    console.log("bestShow:", bestShow)


    // REDUCE


    // TODO: Get the sum of all favorite  numbers

    // const favoriteSum = favoriteNumbers.reduce((previousValue, currentValue) => previousValue+currentValue)
    //
    //
    // console.log("favoriteSum:", favoriteSum)

    const favoriteSum = favoriteNumbers.reduce((previousValue, currentValue, index) => {
        // console.log("index :", index);
        return previousValue+currentValue
    }, 0);

    console.log("favoriteSum:", favoriteSum)

    //TODO:

    const title = 'Full Cats HTML'
    const fullCatsHTML = myCats
        .map(mapElementToLI)
        .reduce((previousValue, currentValue) => previousValue + currentValue, `<h2>${title}</h2><ul>`) + "</ul>"

    console.log("fullCatsHTML:", fullCatsHTML)


    document.getElementsByTagName("body")[0].innerHTML += fullCatsHTML


    // TODO: Create a rollup report that contians the total # of TV Shows, the average IMDB SCORE,
    //  and the all the starting years for the shows


    const initialValue = {
        totalTVShows: 0,
        avgIMDBScore:  0,
        startingYears: []
    }

    const getTVShowsReport = (previousValue, currentValue, index) => {

        let {totalTVShows, avgIMDBScore, startingYears} = previousValue;

        avgIMDBScore = ((avgIMDBScore * index ) + currentValue.imdbScore) / (index + 1);

        startingYears.push(currentValue.firstEpisodeYear)


        return {
            totalTVShows: totalTVShows + 1,
            avgIMDBScore,
            startingYears
        }
    }

    const tvShowReport = arrayOfTVShows.reduce(getTVShowsReport,initialValue);

    console.log("tvShowReport:", tvShowReport);

    const report = [tvShowReport]
        .map((item) => {
            console.log("item :", item);

            const yearsMap = (item, index, array) =>  `<span>${item}</span>${(index < (array.length - 1)) ? "," : "." } `

            return `
        <h2>TV Show Report</h2>
           <div>
            <div>Total TV shows: ${item.totalTVShows}</div>
            <div>Avg IMDB Score: ${item.avgIMDBScore}</div>
            <div>Starting years: ${item.startingYears.map(yearsMap).join("")}</div>
        </div>
        `
        })

    console.log("report:", report)

    document.getElementsByTagName("body")[0].innerHTML += report


</script>

</body>
</html>