Turing School Prework

Task A- Practice Typing:

screenshots of scores will be posted in comments

Task B- Algorithmic Thinking & Logic:

screenshots of completed sections will be posted in comments

Task C- Create your Gist:

Task D- Set up your Environment:

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

Task E- The Command Line:

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

Task F- Learn Ruby:

Option 1 Questions:

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"]?

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".

Task G- Prework Reflection:

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.