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claudiainbytes/JS Functional Programming: .filter() and .map()

Created April 28, 2018 22:43
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  1. claudiainbytes created this gist Apr 28, 2018.
    33 changes: 33 additions & 0 deletions JS Functional Programming: .filter() and .map()
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    /* Combining .filter() and .map()
    *
    * Using the musicData array, .filter, and .map():
    * - filter the musicData array down to just the albums that have
    * sold over 1,000,000 copies
    * - on the array returned from .filter(), call .map()
    * - use .map() to return a string for each item in the array in the
    * following format: "<artist> is a great performer"
    * - store the array returned form .map() in a new "popular" variable
    *
    * Note:
    * - do not delete the musicData variable
    * - do not alter any of the musicData content
    */

    const musicData = [
    { artist: 'Adele', name: '25', sales: 1731000 },
    { artist: 'Drake', name: 'Views', sales: 1608000 },
    { artist: 'Beyonce', name: 'Lemonade', sales: 1554000 },
    { artist: 'Chris Stapleton', name: 'Traveller', sales: 1085000 },
    { artist: 'Pentatonix', name: 'A Pentatonix Christmas', sales: 904000 },
    { artist: 'Original Broadway Cast Recording',
    name: 'Hamilton: An American Musical', sales: 820000 },
    { artist: 'Twenty One Pilots', name: 'Blurryface', sales: 738000 },
    { artist: 'Prince', name: 'The Very Best of Prince', sales: 668000 },
    { artist: 'Rihanna', name: 'Anti', sales: 603000 },
    { artist: 'Justin Bieber', name: 'Purpose', sales: 554000 }
    ];

    const popular = musicData.filter( musician => musician.sales > 1000000 ).map( musician => `${musician.artist} is a great performer` );


    console.log(popular);