LAB: Callbacks

In this lab, you will be exploring asynchronous Javascript using callbacks

Getting Started

Fork the Online REPL for this assignment. Complete your work in the online editor

Requirements

Standard Callback

Write a function called isEven that receives 2 parameters:

• A Number
• A Callback function

Determine if the number is even. If so, invoke the callback with true as an argument, otherwise, false

Create an array of numbers.

• Iterate the array with a for loop
• At each iteration, call the isEven function with the number and a callback function
• The callback should console.log() the return value from isEven()

Reading a file, using an Error First Callback

Write a function called contents that receives 1 parameter: A File Name

• Using the fs module, open and read the contents of the file
• Convert the contents to text
• Output the content to the console.
• Output a console.error() if anything goes wrong.

You can test this by calling your function with ‘./words.txt’ which is a file that exists, and then again with the name of a file that does not exist.

Assignment Submission Instructions

Submit a link to your completed REPL