Section 1
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Last updated
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Date created
Mar 1, 2020
Cards (101)
Section 1
(50 cards)
\W
(regular expression)any nonletter, nondigit or nonunderscore.
.select
array method that selects particular items from an array
&&
Boolean AND operator
.between?(x,y)
method that tells if an argument is within the limits of two numbers
.index
method that tells an argument's place value within an array
.pop
array method that removes last item from an array
.swapcase
a string method that reverses capitalization
.split
a string method that splits a string into an array
.downcase
a string method that uncapitalizes first character
%
the remainder operator
.capitalize
a string method that capitalizes first character
\A
(regular expression)anchor for the start of a string
?x
returns ASCII value of x
\w
(regular expression)any letter, digit or underscore
\d
(regular expression)any digit
!=
comparison operator for "not equal to"
!
operator for "Boolean not"
#{}
interpolation operator
.include?()
an array method that returns TRUE or FALSE if the array contains specified item
\S
(regular expression)any non-whitespace character
\w
(regular expression)any letter, digit or underscore
.next
a string method that changes last character to next alphabetical character
\Z
(regular expression)anchor for the end of a string
.methods
tells you all methods that an object may invoke.
\D
(regular expression)any nondigit
#{}
interpolation operator
.gsub(a, b)
a string method that substitutes ALL occurrences of a string with another.
**
the exponential operator
\d
(regular expression)any digit
.scan()
a string method that scans object for arguments, uses regular expressions.
\Z
(regular expression)anchor for the end of a string
.match(/REGEX/, starting_point)
a string method that outputs the first string matching the defined regular expression from an optionally defined starting point
.map
array method, transforms the contents of an array according to a specified set of rules
\W
(regular expression)any nonletter, nondigit or nonunderscore.
\s
(regular expression)any space, tab, newline or whitespace
.even?
method to determine if an object is an even number
.chop
a string method that removes last character
^
a regular method that is the anchor for the beggining of a line
%arg
sets a text delimiter
\S
(regular expression)any non-whitespace character
\A
(regular expression)anchor for the start of a string
.upcase
a string method that makes string all caps.
.each
an array method that
class
a definition of a concept in an object oriented language.
\s
(regular expression)any space, tab, newline or whitespace
.sort
method that sorts items alphabetically
%q
sets a single character text delimiter for multi-line strings
.sub
a string method that substituition. Requires 2 arguments.
.sub(a, b)
a string method that substitutes THE FIRST occurrence of a string within a string
\D
(regular expression)any nondigit
Section 2
(50 cards)
string
a collection of characters such as "Hello, world!"
@
defines an instance variable, which only exists within the object it was created in.
$
symbol for a global variable, which can be called from anywhere in an application.
regular expressions
a way to describe patterns in text
|x|
passes value into block of code and assigns it the label of "x"
parameters
data passed to methods in parenthesis after a method's name.
yield
tells ruby a value to pass while iterating a block of code
call
runs a proc that has been stored to a variable
inheritance
allows for classes to relate to each other in a hierarchy
code blocks
a section of code with no discrete name which is not a method by itself that can be called upon and can receive an argument.
ARGV
a special array made from arguments that were added to the command line at start up.
float
a number with a decimal point such as 1.0 or 3.1
%w{}
defines array of multiple elements seperated by a space
strip
string method that "cleans" extra spaces from strings
iterator
methods that step through lists element by element (like each, upto, times, etc)
interpolation
mixing expressions into strings
end_with?
string method that determines if a string ends with a defined string
not and or
Boolean not and or (lower preference)
operators
used in an expression to manipulate objects
<=
less than or equal to (comparison operator)
start_with?
string method that determines if a string starts with a defined string
$:.
a variable that lists the directories where Ruby will look for libraries
$
a regular method that is the anchor for the end of a line
@@
defines a class variable. Can be used anywhere within a class
kernel
a module that works everywhere within ruby without being refereed to. Contains many common ruby methods.
method
a set of code within a class or object
break if
conditionally stops a loop
constant
a fixed value, that begins with a capital letter, such as Pi.
object
a single instance of a class.
constant
Data type that is assigned at initialization and typically does not change. Starts with a capital letter.
||
Boolean OR operator
<<
array assignment oprator
hash
a collection of objects or values with associated keys
==
comparison operator for "equal to"
<<
pushes a new item onto the end of an array.
variable
a placeholder for a single object that may be a number, string, list or instance of a defined class
struct
a special class that holds attributes and data but no methods.
<=>
comaprison operator that will read 0 if =, 1 if higher, -1 if lower.
arguments
data passed to methods in parenthesis after a method's name.
<
class inheritance operator.
array
a collection of objects with a defined order
if?then:else
the ternary operator if?then:else
range
the representation of data from a start to end point
>=
greater than or equal to (comparison operator)
flow control
the process of deciding which sections of code to execute based on conditions
|x|
passes value into block of code and assigns it the label of "x"
object orientation
using classes and objects to make real-world concepts in programming.
integer
a whole number
=>
assigns a key to a hash value
local variable
variable that can be used only where it is defined within an application
Section 3
(1 card)