• We can give output to the screen with console.log()
  • Each call to console.log() puts a new line
  • We can put multiple items separated with + or ,
• We can get input by using prompt()
  • We need to declare the prompt function at the top of our code
  • const prompt = require("prompt-sync")();
• We can store values in variables by using the let keyword
  • Variables can be reused without needing let again

You can jump ahead to the task, if you want.

One of the most used structures in programming is the if-else statement. Every programming language has it (or something just like it).

It works like this:

if (some_sort_of_condition) {
  // The code to run if the condition was true
}

This is how we make decisions like:

if (number_of_lives == 0) {
  console.log("Game Over!");
}

• A single equal sign is the assignment operator: x = 5 makes x the number 5.
• A double equal sign is the check operator to ask the question "Is it true"?

• Make a new file: 1.5 - Conditionals 1.js

• We will be using prompt() so add the required line at the top of your code file.

• Ask the user for their age

  • Don't forget, input is a String, not a number, so you'll have to convert it.
  • if they are 50 years old or older, print to the screen "You qualify for the senior discount!"
  • if they are younger than 16, print "You're not old enough to drive yet."

• Now ask the user the user for their name and store the answer in a variable called user_name

  • if the user_name is "Mr. Squirrel" print the squirrel emoji: "🐿️"
  • if the user_name is longer than 7 characters print "You have a long name."
    • You can read how to get the length of a string here.

• Now ask the user how long their name is (how many characters)

  • If the number they enter matches the length of user_name print "That's correct! ✔️"
  • If the number they enter is higher than the length of the name, print "Too high ✖️"
  • If the number they enter is lower than the length of the name, print "Too low ✖️"

We've seen the basic math operators +, -, *, / but there are more. One important one is the modulo operator %. This gives the remainder of a division statement.

For Example:

let x = 5 % 2
console.log(x)   // The output will be 1

x = 19 % 5
console.log(x)   // The output will be 4

x = 20 % 2
console.log(x)   // The output will be 0

We can use modulo to determine if a value is even or odd by checking the remainder of dividing by 2.

• Determine if the user's age is even or odd and print that to the screen.
  For Example: "Your age is an even number." or "Your age is an odd number."

🐿️