Object & Array Scenario Quections

1. User Profile Update
You have:
const user = {
name:"vijay",
age:25,
email:"[e-mail]"};

Update email and a new property isActive = true.

PROGRAM:

const user = {name:"vijay",
    age: 25,
    email: "[e-mail]"
 }
 user.email = "[e-mail]"
 user.isActive = true
 console.log(user)

OUTPUT:
{
name: 'vijay',
age: 25,
email: '[e-mail]',
isActive: true
}

2. Shopping Cart Total
You have:
const cart = [
{name: "shirt",price : 500},
{name: "shoes",price : 1500},
{name :"cap", price : 300}

];

Calculate total price.

PROGRAM:

const cart = [
    {name: "shirt",price : 500},
    {name: "shoes",price : 1500},
    {name :"cap", price : 300}

];

const sum = cart.map(val=> val.price).reduce((total,val)=> total+val)

console.log("total :", sum );

OUTPUT:
total : 2300

3. Find Specific Object

You have:
const user = [
{name: "vijay", age: 25},
{name: "Arun", age: 30},
{name: "Kumar", age: 28}
];

From an array of users,find the user whose name is "Arun".

PROGRAM:

const user = [
    {name: "vijay", age: 25},
    {name: "Arun", age: 30},
    {name: "Kumar", age: 28}
];
function nam(user){
    return user.name == "Arun"
}
const result = user.filter(nam);
console.log(result);

OUTPUT:
[ { name: 'Arun', age: 30 } ]

4. Add item to array

You have:
const products = [{name: "shirt", price:1500},
{name: "shoes", price:1500}];

Add a new product dynamically to an existing product array remove a product with the name "shoes" from the array.From a product list,return only items with price > 1000.

PROGRAM:

const products = [{name: "shirt", price:1500},{name: "shoes", price:1500}];

products.push({name:"watch", price:1700})



const sum = products.filter(val=>val.name!="shoes"&&val.price>1000)
console.log(sum);

OUTPUT:
[ { name: 'shirt', price: 1500 }, { name: 'watch', price: 1700 } ]

5. Count items in object

You have:
const fruits = {
apple:2,
banana:5,
mango:3
};

Find the total number of fruits.

PROGRAM:

const fruits = {
    apple:2,
    banana:5,
    mango:3
};

const newarr = Object.values(fruits)

function arr1(total,value){
    return total + value
}
const arr = newarr.reduce(arr1)
console.log("fruits total:",arr)

OUTPUT:
fruits total: 10

6. Convert array to object
You have:

const users = ["vijay","arun","kumar"];

Convert into:
{ vijay:true,
Arun:true,
Kumar:true }

PROGRAM:

const users = ["vijay","arun","kumar"];

function arr(value){
    return [value,"true"]
}
const result = users.map(arr)
const obj = Object.fromEntries(result)
console.log(obj);

OUTPUT:
{ vijay: 'true', arun: 'true', kumar: 'true' }