JavaScript 30 — Day 4

Jul 19 · 6 min read
const ans = inventors.filter(item => item.year >= 1500 && item.year < 1600);console.table('1', ans);

const ans2 = => `${item.first} ${item.last}`);console.table('2', ans2);

const ans3 = inventors.sort((a, b) => a.year - b.year);console.table('3', ans3);

const ans4 = inventors.reduce((total, obj) => total + obj.passed - obj.year, 0);console.table('4', ans4);

const ans5 = inventors.sort((a, b) => (a.passed - a.year) - (b.passed - b.year));inventors.forEach((item) => { = item.passed - item.year;});console.table('5', ans5);

const ans6 = document.querySelectorAll('.mw-category-group li a');const ary = [];ans6.forEach((item) => { ary.push(item.title); });ary.filter(item => item.indexOf('de') !== -1);

const people = ['Beck, Glenn', 'Becker, Carl', 'Beckett, Samuel', 'Beddoes, Mick', 'Beecher, Henry', 'Beethoven, Ludwig', 'Begin, Menachem', 'Belloc, Hilaire', 'Bellow, Saul', 'Benchley, Robert', 'Benenson, Peter', 'Ben-Gurion, David', 'Benjamin, Walter', 'Benn, Tony', 'Bennington, Chester', 'Benson, Leana', 'Bent, Silas', 'Bentsen, Lloyd', 'Berger, Ric', 'Bergman, Ingmar', 'Berio, Luciano', 'Berle, Milton', 'Berlin, Irving', 'Berne, Eric', 'Bernhard, Sandra', 'Berra, Yogi', 'Berry, Halle', 'Berry, Wendell', 'Bethea, Erin', 'Bevan, Aneurin', 'Bevel, Ken', 'Biden, Joseph', 'Bierce, Ambrose', 'Biko, Steve', 'Billings, Josh', 'Biondo, Frank', 'Birrell, Augustine', 'Black, Elk', 'Blair, Robert', 'Blair, Tony', 'Blake, William'];const ans7 = people.sort((a, b) => (a.split(',')[1] > b.split(',')[1] ? 1 : -1));console.log('7', ans7);

const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck'];const ans8 = data.reduce((total, obj) => {  if (!total[obj]) total[obj] = 0;  total[obj] += 1;  return total;}, {});console.log('8', ans8);

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