In our effort to familiarize ourselves with the Learn IDE, Let's play with strings and numbers again but in the Learn IDE. First things first though, let's open this lab in the Learn IDE. Go ahead and click the blue "Open" button at the top of this page. You should then be whisked away to the IDE.
Alright! This lab is very important. I'm going to teach you how to approach all labs...and really everything in coding. That's a huge statement, but programming is actually fairly simple if you follow this process.
First things first, let's run the code we are given. That should always be your first task. Just like when you are using a map to find a new restaurant, you need to know where you are now before you can know where you need to go. To run the code, type
nodejs index.js in your terminal. You should get something like this:
Name: Joe Height: 74
Look familiar? Open up the
index.js file and take a look. No HTML here, but you can see some basic things. The first two lines of code are below:
var name = "Joe" var height = "74"
These two just assign the value
height are variables.
"74" are Strings. We know they are Strings because they are wrapped in quotes. The next four lines do all of the outputting to your terminal.
console.log("Name:") console.log(name) console.log("Height:") console.log(height)
The first two at first print the String
"Name:", then it prints the value inside
name. Earlier in our program, we assigned
name a value of
"Joe". So, it prints out
Joe. Nice! What if we put
name in quotes?. Give it a try, then run your program again by typing
nodejs index.js. You should see it print out the literal
name instead of
Joe. You just converted
name from a variable into a String. Remove the quotes and everything will work again.
Ok, go ahead and change the
name variable to your name. To do this, modify the first line to something like this
var name = "Janet". Re-run your code and you'll see everything gets updated. Awesome.
Finally, we are going to modify our height. You could modify the height the same way we modified
name. Simply change the
"74" to whatever your height is. Remember last time though? We wanted to just have you "grow" by adding
1 to our current height. We can try that out by modifying the
console.log(height) line by writing
console.log(height+1). If you re-run that code you'll see it just appends
1 to the end of whatever height you had. That's not what we want! We want proper addition
to occur. Just like last time, we need to translate our String (
"74") into a number. You can do this in your
console.log like this:
console.log(parseInt(height) + 1 ). That converts
"74" into a number and then adds one. If you re-run the code now you'll see that it works! The other way we can modify this is to change the assignment of the variable in the first place. So let's modify the
var height = "74" line to look like this
var height = 74
Boom! We took away the quotes and now it's a number not a string. You can remove the
parseInt part of your
console.log to look like this:
console.log(height + 1) and everything should work properly.
Now it's time to submit your work back to learn. Go ahead and run
learn submit in the terminal. You should then get a few more green lights and be ready to move on to the next lesson. Congratulations
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