JavaScript Arrays+Methods

const inventors = [
    {first: 'Albert', last: 'Einstein', year: 1879, passed: 1955},
    {first: 'Isaac', last: 'Newton', year: 1643, passed: 1727},
    {first: 'Galileo', last: 'Galilei', year: 1564, passed: 1642},
    {first: 'Marie', last: 'Curie', year: 1867, passed: 1934},
    {first: 'Johannes', last: 'Kepler', year: 1571, passed: 1630},
    {first: 'Nicolaus', last: 'Copernicus', year: 1473, passed: 1543},
    {first: 'Max', last: 'Planck', year: 1858, passed: 1947},
]
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'];

//1.FILTER THE INVENTORS WHO WERE BORN IN THE 1500S
const fifteen=inventors.filter(function (inventor){
    if(inventor.year>=1500 && inventor.year<=1599)
        return true; //keep it
    else
        return false;
});
console.log(fifteen);
console.table(fifteen);

//2.GIVE US AN ARRAY OF THE INVENTORS FIRST AND LAST NAME WITH MAP
const fullNames=inventors.map(inventor=>inventor.first +" "+ inventor.last);
console.log(fullNames)
console.table(fullNames);

//3.SORT THE INVENTOR BY BIRTHDATE OLDEST TO YOUNGEST
const ordered=inventors.sort(function (firstPerson, secondPerson){
    if(firstPerson.year>secondPerson.year)
    {
        return 1;
    }
    else return -1;
});
console.log(ordered);
console.table(ordered)

const  ordered2=inventors.sort((olderPerson , youngerPerson)=>olderPerson.year>youngerPerson.year?1:0)
console.log(ordered2);
console.table(ordered2);


//4.HOW MANY YEARS DID ALL THE INVENTORS LIVE USING REDUCE METHOD
const totalYears=inventors.reduce((total, inventor)=>{
    return total+(inventor.passed - inventor.year);
},0);
console.log(totalYears)

//5.SORT INVENTORS BY YEARS LIVED
const oldest=inventors.sort(function (firstPerson,otherPerson){
   const lastGuy=firstPerson.passed - firstPerson.year;
   const nextGuy=otherPerson.passed - otherPerson.year;

   if(lastGuy>nextGuy)
       return -1;
   else
       return 1;
});
console.log(oldest)
console.table(oldest)

//6.CREATE A LIST OF BOULEVARDS IN PARIS THAT CONTAIN 'DE' IN THE NAME
// const category=document.querySelector('.mw-category'); //where the links are contained
// const links=[...category.querySelectorAll('a')]//every link in the page + convert to array
// const de=links
//     .map(link=>link.textContent)
//     .filter(streetName=>streetName.includes('de'));

//7.SORT THE PEOPLE ALPHABETICALLY BY NAME
const alpha=people.sort(function(lastOne, nextOne){
    const [aLast,aFirst]=lastOne.split(", ");
    const [bLast,bFirst]=nextOne.split(", ");

    if(aLast>bLast)
        return 1
    else return -1;
});
console.log(alpha)
console.table(alpha)

//8.SUM UP THE INSTANCES OF THESE WITH REDUCE
const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike',
    'walk', 'car', 'van', 'car', 'truck' ];
const transportation=data.reduce(function (obj,item){
    if(!obj[item]){
        obj[item]=0;
    }
    obj[item]++
    console.log(item)
    return obj;
},{

});
console.log(transportation);