- screenshots of scores will be posted in comments
- screenshots of completed sections will be posted in comments
- Did you run into any issues?
Brew was unhappy with some previous installations of Node and a few other programs.
- How do you open Atom from your Terminal?
I don't know, but "sublime" opens Sublime!
- What is the file extension for a Ruby file?
.rb
- What is the Atom shortcut for hiding/ showing your file tree view?
⌘K, B
- What is the Atom shortcut for quickly finding a file (fuzzy finder)?
⌘P
- screenshots of your terminal after each exercise will be posted in comments
Day One Questions:
- What does pwd stand for, and how is this command helpful?
Print working directory. It shows you where you are in the file system.
- What does hostname tell you, and what shows up in YOUR terminal when you type hostname?
It shows the name of the current host, which in my case is SAMUELs-MacBook-Pro.local
IRB Completed day 2
- How do you start and stop irb?
"irb" and "exit"
- What might you use irb for?
determining what value a Ruby statement returns
Variables Completed day 2
- How do you create a variable?
by typing a legal variable name, followed by the assignment operator, followed by the value
- What did you learn about the rules for naming variables?
Variable names cannot start with a number or include a - symbol. There is a strange condition if the first letter is capitalized, but I'm not sure what happens.
- How do you change the value of a variable?
By reassigning like you did upon variable creation.
Datatypes Day 3 completed
- How can you find out the class of a variable?
With the .class method
- What are two string methods?
.to_i .class
- How can you change an integer to a string?
With the .to_s method
Strings Day 3 completed
- Why might you use double quotes instead of single quotes in Ruby?
To create a string that includes single quotes, or to use interpolation
- What is this used for in Ruby: #{}?
Interpolating values into a string. Ruby evaluates the Ruby code in the brackets.
- How would you remove all the vowels from a string?
With the String.delete('aeiou') method
Input & Output Day 3 completed
- What do 'print' and 'puts' do in Ruby?
They output a string. Every output from puts begins on a new line, but not so for strings. Both return nil.
- What does 'gets' do in Ruby?
Gets takes input from the user.
- Add a screenshot in the comments of the program you created that uses 'puts' and 'gets', and give it the title, "I/O".
Numbers & Arithmetic Day 4 completed
- What is the difference between integers and floats?
Integers are whole numbers, floats are fractions
- Complete the challenge, and post a screenshot of your program in the comments with the title, "Numbers".
Booleans Day 4 completed
-
What do each of the following symbols mean?
- == equal to
-
= greater than or equal to
- <= less than or equal to
- != not equal to
- && and
- || or
-
What are two Ruby methods that return booleans?
.nil? .end_with?
Conditionals Day 5 completed
- What is flow control?
It's a way of controlling what code is executed and when, based on conditions in the code
- What will the following code return?
apple_count = 4
if apple_count > 5
puts "Lots of apples!"
else
puts 'Not many apples...'
end
I think "puts" doesn't return a value, so nothing. But it would print "Not many apples..."
- What is an infinite loop, and how can you get out of one?
When a program enters a loop that will never end. You have to kill the program to exit one.
- Take a screenshot of your program and terminal showing two different outputs, and post it in the comments with the title, "Conditionals".
nil Day 5 completed
- What is nil?
A datatype that represents "nothing"
- Take a screenshot of your terminal after working through Step 4, and post it in the comments with the title, "nil".
Symbols
- How can symbols be beneficial in Ruby?
They are an efficient way to store frequently referenced values.
- Does naming symbols use the same rules for naming variables?
Yes, except they start with :
- Take a screenshot of your terminal after working through Step 4, and post it in the comments with the title, "Symbols".
Arrays
- What method can you call to find out how many elements are in an array?
.length
- What is the index of pizza in this array: ["pizza", "ice cream", "cauliflower"]?
0
- What do 'push' and 'pop' do?
Respectively, they add and remove an element to the end of the array.
Hashes
- Describe some differences between arrays and hashes.
Hashes are collections of values attached to keys. Where arrays are organized based on a numerical index, hashes use strings to arrange their data.
- What is a case when you might prefer an array? What is a case when you might prefer a hash?
Arrays are good for storing data where the "key" is irrelevant. Basically, anything that fits on a list would go well in an array. A collection of books, for example. Since the factors describing a book don't fit as well into a list, a hash is really a better way to store their data, because a key can clarify if the value is a title, an author, a blurb or whatever.
-
- Take a screenshot of your terminal after working through Step 2, and post it in the comments with the title, "Hashes".
- Were you able to get through the work? Did you rush to finish, or take your time?
I've done everything except the empathetic programming responses. I'm on a bit of a time crunch, so I'm rushing. I will get to the empathetic programming articles and videos, because I do think that is interesting and valuable.
- What are you most looking forward to learning more about?
Algorithms. The work on Brilliant was fun.
- What topics would you most like to see reinforced by instructors?
Hm... I feel like the topics covered by this prework don't bear reinforcement beyond using them naturally. They weren't complicated.
- What is most confusing to you about what you've learned?
Symbols. I think I understand why they'd be valuable, but I'm having trouble imagining a scenario where I'd use them.
- What questions do you have for your student mentor or for your instructors?
Why are integers and floats separate classes? It seems like a single number class would be able to encapsulate both.
Day 1:
Task A - Typing score
Task B - Algo practice
Git, Ruby and RVM versions
