Javascript:Check numbers are co prime using divisor list

 

function getDivisor(num) {

    let divisor = [];

    for (let i = 2; i <= num; i++) {   // fixed: was i <= num - 1

        if (num % i === 0) {

            divisor.push(i);

        }

    }

    return divisor;

}

function areCoPrime(num1, num2) {

    console.log(`First Number:${num1} Second Number ${num2}`);

    let divisor1 = getDivisor(num1);

    let divisor2 = getDivisor(num2);

    console.log("Divisor", divisor1);

    console.log("Divisor", divisor2);

    let common = divisor1.filter(num => divisor2.includes(num));

    if (common.length > 0) {

        return "Pair is not co-prime";

    } else {

        return "Pair is co-prime";

    }

}

console.log(areCoPrime(6, 9));

// Pair is not co-prime

console.log(areCoPrime(8, 15));

// Pair is co-prime

console.log(areCoPrime(7, 11));

// Pair is co-prime

console.log(areCoPrime(5, 10));

// Pair is not co-prime (this one was wrong before)

console.log(areCoPrime(7, 7));

// Pair is not co-prime (this one was wrong before)

Javascript:Check numbers are co prime using gcd

function gcd(a, b) {

  a = Math.abs(a);

  b = Math.abs(b);

  while (b !== 0) {

    [a, b] = [b, a % b];

  }

  return a;

}

function areCoPrime(num1, num2) {

  if (!Number.isInteger(num1) || !Number.isInteger(num2)) {

    throw new TypeError("Both arguments must be integers");

  }

  return gcd(num1, num2) === 1;

}

console.log(areCoPrime(6, 9));   // false (gcd = 3)

console.log(areCoPrime(8, 15));  // true  (gcd = 1)

console.log(areCoPrime(7, 11));  // true  (gcd = 1)

console.log(areCoPrime(5, 10));  // false (gcd = 5, the case your old code got wrong)

console.log(areCoPrime(7, 7));   // false (gcd = 7)

EC2 vs Lambda

 

Feature                 EC2                                         Lambda

Server management       You manage it                               AWS manages it

Execution               Continuous or on demand                     Event/request triggered

Scaling                 Configure or use Auto Scaling               Automatic

Billing                 Instance running time, plus other charges   Requests and execution duration, plus other charges

Maximum                 execution time  No fixed                    Lambda-style limit  15 minutes per invocation

OS access               Full control over the VM                    No full underlying server access

Best for                Full backend applications                   Short-lived functions and event-driven workloads

Javascript:Fetch

 

Using fetch to make api call.

Code:

const link = "https://jsonplaceholder.typicode.com/posts/1"

fetch(link).then((res)=>{

   return res.json()

}).then((data)=>{

   console.log(data)

})

Output:

{

  userId: 1,

  id: 1,

  title: 'sunt aut facere repellat provident occaecati excepturi optio reprehenderit',

  body: 'quia et suscipit\n' +

    'suscipit recusandae consequuntur expedita et cum\n' +

    'reprehenderit molestiae ut ut quas totam\n' +

    'nostrum rerum est autem sunt rem eveniet architecto'

}

Now lets explore how to make post request.

//post request

const linkPost = "https://jsonplaceholder.typicode.com/posts";

fetch(linkPost, {

    method: "POST",

    headers: {

        "Content-Type": "application/json"

    },

    body: JSON.stringify({

        title: "JavaScript",

        body: "Learning fetch POST call",

        userId: 1

    })

}).then((res)=>{

   return res.json()

}).then((data)=>{

   console.log(data)

})

Output:

{

  title: 'JavaScript',

  body: 'Learning fetch POST call',

  userId: 1,

  id: 101

}

Javascript: delete Operator

 

Guess output of following code.

const name ="India"

capital = "New Delhi"

console.log(delete name);

console.log(delete capital);

Explanation:

delete operator delete property from global object,it will not delete variable

declaared by var ,let,const.so output will be

false

true

Javascript: Array Sorting Guess output of the Code

Guess output of code.

Code

let arr =[1,21,30,4]

arr.sort((a,b)=>{

 return b-a

})

console.log(arr)

Here sorting will be done element are treated as number & sorting is descending.

output will be [ 30, 21, 4, 1 ]

let arr =[1,21,30,4]

arr.sort()

console.log(arr)

Here sorting will be done in lexographic order ascending where each element is trated as string

output will be [1,21,30,4]