the-vishal-kumar

1. (Optional) Follow the link to learn How to create AWS EC2 Instance
2. Open terminal, connect to your ec2 instance using ssh command, e.g. sudo ssh -i fungyaan-frankfurt.pem ubuntu@ec2-18-195-20-82.eu-central-1.compute.amazonaws.com
   1. If prompted password, write your computer user's password and press enter
   2. You have successfully logged in as ubuntu user in your EC2 instance.
3. Switch to superuser

   sudo su
   

   1. Update the package index files on the system

the-vishal-kumar

1. Go to https://console.aws.amazon.com/
2. Signup/Signin using your credentials
3. Go to EC2 service
4. Click on Launch Instance
5. Name and tags
   1. Fill in the name, e.g. fungyaan
6. Application and OS Images
   1. Choose OS, e.g. Ubuntu
7. Key pair
8. Click on Create new key pair

the-vishal-kumar

1. Go to terminal, open the project directory.

   cd project

2. Run the following commands:

   1. Delete node_modules directory

      rm -rf node_modules

the-vishal-kumar

const isPointInsideCircle = (centre, radius, point) => {
    return (Math.pow(point.x - centre.x, 2) + Math.pow(point.y - centre.y, 2)) <= (Math.pow(radius, 2));
}

the-vishal-kumar

const findCircle = (point1, point2, point3) => {
    const x1 = point1.x
    const x2 = point2.x
    const x3 = point3.x
    const y1 = point1.y
    const y2 = point2.y
    const y3 = point3.y

    const x12 = (x1 - x2);
    const x13 = (x1 - x3);

the-vishal-kumar

• Checking for null is a common task that every JavaScript developer has to perform at some point or another
• The typeof keyword returns "object" for null, so that means a little bit more effort is required
• Comparisons can be made:
  • null === null to check strictly for null
  • null == undefined to check loosely for either null or undefined
• The value null is falsy, but empty objects are truthy, so typeof maybeNull === "object" && !maybeNull is an easy way to check that a value is not null
• Finally, to check if a value has been declared and assigned a value that is neither null nor undefined, use typeof
• typeof maybeUndeclared !== "undefined" && (typeof maybeUndeclared !== "object" || !maybeUndeclared)