JavaScript Array Method Exercises 02

In this video, you'll get some more practice with JavaScript Array Methods by completing some practical exercises.

01:10 Exercise One (02:05 Final Solution)
02:15 Exercise Two (03:23 Final Solution)
03:45 Exercise Three (04:43 Final Solution)
04:50 Exercise Four (05:26 Final Solution)
05:54 Exercise Five (07:30 Final Solution)

In the tutorial, you'll learn about a few more different array method available in JavaScript by completing some simple exercises on an array of data which is loosely based around some ecommerce orders.

Don't worry if you get stuck - i've provided example solutions but feel free to post your own if you come up with something different.

#JavaScript #Practice #Exercises Channel Handle @codebubb

[codewithbubb]

Got your own solution to one of the exercises? Post it as a comment below!

[robostudio]

const productIDSold = orders => orders.some(order => order.delivered && order.items.some(item => productId = '123'));
I really appreciate the effort you put into these useful exercises. Thank you. Hope my code is ok

[motivation_]

5) const sold = orders.some(order => order.items.some(item => item.productId === '123')) is it right?

[badselection]

Great vid, 1 question - why does the object you create in the second example have to be inside parentheses?

[toscaantosca]

#5

//have any products with an id of 123 been sold?
const isSold = orders.reduce((acc, order) => [...acc, ...order.items], []).some(item => item.productId === '123')

//how much the product have been sold?
const howMuchSold = orders.reduce((acc, order) => [...acc, ...order.items], []).filter(item => item.productId === '123').length

Finally, I began to understand a little better how the method Reduce works :)

[maximemenelikmbengongone]

5) const anyProductsSold = orders.some(order => order.items.find(ord => ord.productId === '123')) Is it right?

[marcoonlinetv]

//5 Have any products with an id of 123 been sold? return orders.filter(item=> item.orderId === '123')[0].items.length > 0

[Game-viif]

another possible solution for Exercise # 5
orders.flatMap(order => order.items).some(item => item.productId === '123')

[priyanshukatuwal]

Ex-5 using For method

let count = 0;
for (x of orders) {
x.items.forEach(element => {
if (element.productId === "123") count++
})
}
console.log(count);

[elliott_]

excercise 5:
const orders = (val) => val.filter( order => order.items.filter(item => item.productId === '123').length);

[Sam-czck]

my solution for exercise 5:

orders.filter(order => order.items.some(item => item.productId === '123')).length

[amritkjha]

orders.some((order, items) => (order.items.filter(item => item.productId === "123").length > 0)); //it worked, i hope it is correct.

[toni]

Hello, can somebody explain to me why this doesnt work for ex.5? Ty

[magistrfox]

I had ex.3 solution:

orders.map(order => order.delivered === true ? 'yes' : 'no').includes('no') ? 'no' : 'yes';

and ex. 5:

orders.map(order => order.items.map(item => item.productId).join(' ')).filter(id => id.includes('123')).length;

this are too long solutions :)))

[rezaulmasum]

Problem Number 5: const orderCheck = () =>
orders.filter(
(order) => order.items.filter((item) => item.productId === "123").length,
).length;

[saptarsidebnath]

ex5:

orders.some((item) => item.delivered && item.items.some((elem) => elem.productId === "123"));

[gheorgheslicari]

Great :)
orders.reduce(order => order.customerId === '123'); // false why is showing false ? EX:4

[aakashpoly]

For Exercise 5:
Have any products with an id of 123 been sold?
orders.some((order) => order.items.find((item) => item.productId === "123")); //true