Javascript/25_iterations.js at main · Chetan0724/Javascript · GitHub

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const coding = ["js", "ruby", "java", "python", "cpp"]

const values = coding.forEach( (item) => {
    console.log(item);
    return item
} )

console.log(values);


const myNumsOne = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

// const newNums = myNumsOne.filter((num) => num > 4)

const newNums = myNumsOne.filter((num) => {
    return num > 4
})

console.log(newNums);


const newNumsOne = []

myNumsOne.forEach( (num) => {
    if (num > 4) {
        newNumsOne.push(num)
    }
})

console.log(newNumsOne);


const books = [
    { title: 'Book One', genre: 'Fiction', publish: 1981, edition: 2004 },
    { title: 'Book Two', genre: 'Non-Fiction', publish: 1992, edition: 2008 },
    { title: 'Book Three', genre: 'History', publish: 1999, edition: 2007 },
    { title: 'Book Four', genre: 'Non-Fiction', publish: 1989, edition: 2010 },
    { title: 'Book Five', genre: 'Science', publish: 2009, edition: 2014 },
    { title: 'Book Six', genre: 'Fiction', publish: 1987, edition: 2010 },
    { title: 'Book Seven', genre: 'History', publish: 1986, edition: 1996 },
    { title: 'Book Eight', genre: 'Science', publish: 2011, edition: 2016 },
    { title: 'Book Nine', genre: 'Non-Fiction', publish: 1981, edition: 1989 },
];

let userBooks = books.filter((bk) => bk.genre === 'History')
console.log(userBooks);

userBooks = books.filter( (bk) => bk.publish >= 1995 )
console.log(userBooks);

userBooks = books.filter( (bk) => {return bk.publish >= 1995} )
console.log(userBooks);

userBooks = books.filter( (bk) => {
    return bk.publish >= 1995 && bk.genre === 'History'
} )
console.log(userBooks);


const myNumbers = [1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10]

const newNumsStar = myNumbers.map( (num) => num + 10 )
console.log(newNumsStar);

// const newNumsStar = myNumbers.map( (num) => {return num + 10} )
// console.log(newNumsStar);

const newNumsOneStar = myNumbers
                        .map( (num) => num * 10 )
                        .map( (num) => num + 1 )
                        .filter( (num) => num >= 40)

console.log(newNumsOneStar);


const myNums = [1, 2, 3]

const myTotal = myNums.reduce(function (acc, currval) {
    console.log(`acc: ${acc} and currval: ${currval}`);
    return acc + currval
}, 0)

console.log(myTotal);

const myTotalOne = myNums.reduce( (acc, curr) => acc + curr, 0)
console.log(myTotalOne);


const shoppingCart = [
    {
        itemName: "js course",
        price: 2999
    },
    {
        itemName: "py course",
        price: 999
    },
    {
        itemName: "mobile dev course",
        price: 5999
    },
    {
        itemName: "data science course",
        price: 12999
    }
]

const priceToPay = shoppingCart.reduce((acc, item) => acc + item.price, 0)

console.log(priceToPay);