Haiti to Ukraine explainer


#1

The aim of this puzzle: Turn the Haitian flag into the Ukrainian flag.
Walkthrough of the solution: The first line of code creates a variable called x and gives it a starting value of blue. That means the next three drawBox(x) will draw blue boxes. Then there’s a line that says x = red which changes the value stored inside of x to the color red. Then there are three more drawBox(x) commands. If you run the code the first time, you’ll see that the bottom stripe is red and you want it to be yellow. So, you need to make sure the last three drawBox() commands are getting a value of yellow. Instead of changing each x into yellow, you can simply change the line that assigns red to x into x = yellow. Then, every time you use x after that, drawBox(x) will run the same as drawBox(yellow) unless the value of x changes again later in your code. The boxes you already drew won’t change their color – once you draw them, they’re locked in.
Sample code solution:
(Tap below to reveal)

var x = blue;
drawBox(x);
drawBox(x);
drawBox(x);
newLine();
x = yellow;
drawBox(x);
drawBox(x);
drawBox(x);

JavaScript Concepts: Assignments, Calling Functions, Identifiers, Variable Declaration
Grasshopper Concepts: drawBox()


Haiti to Ukraine
Haiti to ukraine issue
#2

Why can’t we use two variables in single code


#3

Hey @Sridhar_Reddy,

The aim of this puzzle is to change a variables value. If you create a new variable, you’re not changing the other variable’s value.

To change a variable’s value you don’t need to use the var key, rather assign it a new value using the = key. Like: x = yellow.

I’m hoping this helps!
H :slight_smile:


#4

If solution for this problem was word then


#5

Then this should become Y but why was solution shows 5 as correct


#6

x = 5 because 5 is the value of y. When you assign a variable to another variable, it takes the value. In your first picture (with alphabet = ‘word’;), alphabet is not assigned the variable word but the string ‘word’. If alphabet was assigned to the variable word, then alphabet would be assigned to the value of word, ‘alphabet’.
I Hope this helps and doesn’t confuse you more :grin:


Error or I'm I not learning the basics
#7

Hi! Basically “print” is trying to look up the variables assigned. Javascript will read it out like this image.


#8

Why is a var command not needed for the second x?


#9

Hi @bcgalloway71,

var is used to define a new variable. Once the variable is created, you no longer have to use var to use or change the variable later in the program.

Hope this helps! Feel free to reply if otherwise, and I can try to go more in-depth! :smile:


#10

Nope that explains it perfectly! Thanks so much! I haven’t coded since the 80’s (BASIC), so this is exciting to get back into it again.


#11

‘alphabet’ is a string in the above case and
Var alphabet is a variable…


#12

In the example it says that its red, yet its yellow. Am I missing something?


#13

Same here, therfore i can’t solve this step.


#14

Hey @Rob_Peebles,

Can you share a screenshot of your code? That way we can have a look to see if it matches the solution for this puzzle?

H :slight_smile:


#15

I may add some words to the brilliant explanations we have here:
The importance of the var comand is that, when you declare a variable, the computer needs to know that some space needs to be reserved in memory for data to be stored in that variable.
So that’s achieved though the keyword var.

Once some space is already reserved in memory, no need to use the keyword anymore - just referencing the variable through it’s name is good, as it works sort of like referencing the address in the memory where data will be (or is) stored.

So, in short, var is used to assign an address in memory for the variable you’re creating.


#16

I figured it out. The instructions are misleading.
It’s just x = red. It looks like they fixed it as the sample is now showing up correctly for me now even after its reset.


#18

This solution does not seem to work. I have tried quite a few times changing from red to yellow but it won’t accept as right answer.

Nevermind, I figured out what is was asking you to do.


#19

Another reason for var is to help identify typos. So, in environments where Strict Mode can be enabled, this might give a warning or error:

var wahh = 1
wahhhhhhh = wahh + 1

–Scott.


#20

Hey @MakerCK_Studio,

You’ve created a new variable, rather than updating the variable’s value. Try resetting your code, then change x = red to x = yellow; no need to use the var key.

H :slight_smile:


#21

Hi,só im having a problem maybe i didnt get the challange ( im a newbie) but It is to make the flag Go Blue and yellow, i did that( the va x = Blue and yellow) but the game is not reaponding.
Again, im a noobie
can Someone explain what is happening?