Basics

Question 1

Method Structure

Answer 1

def exampleMethod(example1, example2)
  return exampleVariable
end

Question 2

To check length of string add

Answer 2

variable.length

Question 3

puts

Answer 3

text output with newline at end
converts everything to a string
converts nil elements to empty string
returns nil

Question 4

print

Answer 4

text output with no newline at end
converts everything to a string
text output of array includes brackets
returns nil

Question 5

p & pp

Answer 5

both: text output is raw objects passed to it
both: returns the same object that was passed to it as an argument
both: good for debugging
pp: attempts to print large hashes and arrays in a more readable format

Question 6

if/else/else if format

Answer 6

if condition1
   example
elsif condition2
   example
else
   example
end

Question 7

while loop format

Answer 7

while condition
example
end

Question 8

declaring array

adding to array with shovel

Answer 8

newArray = []

newArray &laquo_space;variable

Question 9

Enumerable Iteration Methods
How to iterate through an ARRAY, no passing index
Single line method format
Multiline method format

Answer 9

arrayExmaple.each
Single line method for a single line of code in block:
arrayExample.each { |elementName| puts elementName }
Multiline for multiple lines of code in block:
arrayExample.each do |elementName|
puts elementName
puts “example”
end

Question 10

Enumerable Iteration Methods

How to iterate through a STRING, no passing index

Answer 10

stringExample.each_char
stringExample.each_char |char|
puts char
end

Question 11

Enumerable Iteration Methods

How to iterate through an ARRAY while passing index

Answer 11

arrayExmaple.each_with_index

arrayExample.each_with_index do |elementName, index|
puts elementName
puts index
end

Question 12

Enumerable Iteration Methods

How to iterate through a STRING while passing index

Answer 12

stringExample.each_char.with_index do |char, index|
puts char
puts index
end

Question 13

Enumeration refers to

Answer 13

Enumeration refers to traversing over objects. In Ruby, we call an object enumerable when it describes a set of items and a method to loop over each of item.

Question 14

Range Enumerable
Iterate from start number to end number (inclusive)
Iterate from start number to end number (excluding end)

Answer 14

(start. .end).each
ex: (start..end).each { |num| puts num }

(start. ..end).each
ex: (start…end).each { |num| puts num }

Question 15

Enumerable to repeat something a particular number of times

Answer 15

numberOfTimes.times { what to do }
ex: 3.times { puts "echo" }
echo
echo
echo

Question 16

How to find first instance of element/char in array/string

Answer 16

arr.index(ele) / str.index(char)

Question 17

What is the output of 
str = ""
greeting = "hi"
str += greeting * 3
puts str

Answer 17

hihihi