learn-co-curriculum/looping-while-until

The while and until Constructs

Objectives

1. Build a method that uses while
2. Build a method that uses until

Using while and until

It's our first year at Hogwarts and we're struggling to master the levitation charm, "Wingardium Leviosa". Currently, we have a levitation force of 6. We need to have a levitation force of 10 in order to actually levitate that feather.

First, we'll write a while loop that will continue to puts the phrase "Wingardium Leviosa" while our levitation force is less than 10. Every time we puts that phrase, we should increment our levitation force by 1.

Then, we'll solve this again by using an until loop. It will puts the phrase "Wingardium Leviosa" until the levitation force is equal to 10, incrementing the levitation force by 1 each time we puts the phrase.

Instructions

1. Run the test suite in this lab to get started.

2. Let's get the first test passing by coding our solution in while.rb: Fill out the content of the using_while method so that calling it will puts the desired phrase while your levitation force is less than 10. Remember, every time you puts the phrase, you should increment your levitation force by 1.

3. Let's get the second test passing by coding our solution in until.rb: Fill out the content of the using_until method to puts the desired phrase, "Wingardium Leviosa", until our levitation force equals 10. Remember, every time you puts the phrase, you should increment your levitation force by 1.

Hint: If you get stuck an infinite loop when you run your tests or your code, you can abort the test run or code by pressing CONTROL+C on your keyboard.

looping-while-until's Issues

Inconsistent indentation between while.rb and until.rb

until.rb uses eight spaces for its indentation, whereas while.rb uses one tab.

Issue #16 first reported this issue as having four spaces, but commit 32799c8 that supposedly fixes it replaced it with eight spaces instead of one tab like in while.rb.

Ruby convention seems to favor two spaces for indentation. For beginners, the inconsistency can be confusing.

this example was never given

Remember our long and repetitiously-counting code that used if statements to count from 0 to 20? Well, we can refactor that into simple, readable, short code with the while construct:

(nope, I don't remember.)

Spec description is wrong

while_spec is testing for an output 4X, but instructs students to output it 10X

Error in Looping-While-Until lab

I'm getting an error occurs while loading after hitting "learn"

An error occurred while loading ./spec/until_spec.rb.
Failure/Error: require_relative "../lib/until.rb"

0 examples, 0 failures, 2 errors occurred outside of examples

we never explicitly looked at `.times` before

it was mentioned in passing in earlier curriculum, but we were kind of told to ignore it

Update from user

User: Garett Arrowood

Batch: 000

Current Lesson: OO Cash Register

Location: https://learn.co/tracks/web-development-with-ruby-on-rails/ruby/looping/looping-while-and-until-constructors?track_id=5309&batch_id=76

Bug Description: In the Until example - Change the original value of counter to 0.

Tests passing at beginning

When I run learn on this project the tests pass - correct answers already inside.

unable to ask a question

Do we want to introduce or provide links to while and until syntax?

Looks to me like we're asking people to use while and until loops, but in the previous class when we introduced loops we didn't provide either of those syntaxes. Is this a deliberate "time for you to guess/google it", were those syntaxes mentioned earlier in the curriculum and/or is this not a problem because people are getting through it?

Not saying we should change this, but wanted a placeholder so we could have a conversation about it . . .

Lab message

When I clicked the "Open IDE" button and the lab opened, there was a prompt stating I was opening a lesson past the point where I was in the curriculum. I clicked Yes and looked at the ReadMe compared to the website and they were the same lesson.

Message in terminal: You are attempting to open a lesson that is beyond your current lesson. Are you sure you want to continue?

When I attempt to fork the lesson, I get this message in my terminal: "You are attempting to open a lesson that is beyond your current lesson. Are you sure you want to continue?" This is not the case, as I am going in order with the lessons....

LOOPING - WILE AND UNTIL CONSTRUCTORS

Couldn't edit the Title here, but the lesson misspelled While as Wile in title.

Actually spec `while` vs `until` usage.

The tests should try to enforce this syntax.

new readme and repl

no more repl, now a lab. ready to deploy after 👀

@jmburges @aviflombaum

until.rb has incorrect indentation

4 spaces, gasp!

Not Forking

I solved the lab and the passed the test but the lab didn't fork

"While" is misspelled in the title

"While" is misspelled in the title and navigation

LOOPING - WILE AND UNTIL CONSTRUCTORS

Levitation Charm?

In the "USING WHILE AND UNTIL" it says "Guess what? We're still struggling to master that levitation charm! But we are so close...."

Seems like this lab is referring to a previous example (or I guess "Wingardium Levios" is a levitation charm?). Worth clarifying a bit.