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Ruby Dictionary

Ruby Dictionary Index

[Setup] Ruby Development Environment	Steps to set up an environment for installing and running Ruby.
String.length / size	Getting the length of a string.
String.include? / start_with? / end_with?	Checking string existence and prefix/suffix determination.
String.index / rindex	Getting the position of a substring.
String.slice / []	Extracting a portion of a string.
String.sub / gsub	Replacing strings.
String.upcase / downcase / capitalize / swapcase	Converting between uppercase and lowercase.
String.strip / lstrip / rstrip / chomp / chop	Removing whitespace and newlines.
String.split	Splitting a string and converting to an array.
String.* / center / ljust / rjust	Repeating and padding strings.
String.to_i / to_f / to_sym / inspect	Converting a string to other types.
String.encoding / encode / force_encoding	Checking and converting character encodings.
sprintf() / % Operator	String formatting.
Array.push / pop / shift / unshift	Adding and removing elements at the end or beginning of an array.
Array.insert / delete / delete_at / compact	Adding, removing, and eliminating nil at arbitrary positions.
Array.include? / index / find_index	Checking element existence and searching positions.
Array.any? / all? / none? / count	Checking conditions and counting elements.
Array.map / collect	Transforming each array element to create a new array.
Array.select / filter / reject	Extracting or excluding elements matching a condition.
Array.reduce / inject	Combining an array into a single value.
Array.flatten / uniq / compact	Unnesting, removing duplicates, and removing nil.
Array.sort / sort_by / reverse	Sorting and reversing an array.
Array.concat / + / flatten / zip	Concatenating arrays.
Array.slice / [] / first / last	Getting a portion of an array.
Array.each / each_with_index / each_with_object	Looping through an array.
Array.join / split / flatten / product	Converting arrays to strings and computing Cartesian products.
Hash.keys / values / has_key? / has_value?	Listing keys and values, and checking existence.
Hash.fetch / store / delete / merge	Getting, setting, deleting, and merging values.
Hash.each / map / select / reject	Looping, transforming, and extracting from a hash.
Hash.to_a / Hash[] / transform_keys / transform_values	Transforming a hash.
Hash.filter_map / flat_map / reduce	Advanced processing on a hash.
Numeric.to_i / to_f / to_r / to_s	Converting number types.
Numeric.abs / round / ceil / floor / truncate	Absolute values and rounding numbers.
Math.sqrt / log / sin / cos / Math::PI	Using mathematical functions and constants.
Numeric.times / upto / downto / step	Iterating with integers.
Numeric.even? / odd? / zero? / between? / clamp	Integer determination.
Range.to_a / include? / cover? / each	Basic operations on range objects.
Range.min / max / sum / count / step	Aggregating ranges and step iteration.
Regexp.new / =~ / match / match?	Pattern matching with regular expressions.
String.scan / match / =~	Searching strings with regular expressions.
Symbol.to_s / to_proc / inspect	Converting and using symbols.
Enumerable.find / find_all / detect	Searching for elements that match a condition.
Enumerable.min_by / max_by / minmax / minmax_by	Getting minimum and maximum values.
Enumerable.flat_map / group_by / tally	Flattening, grouping, and aggregating.
Enumerable.each_slice / each_cons / chunk / zip	Advanced iteration for splitting and combining.
Block / yield / block_given?	Defining and calling blocks.
Proc.new / proc / lambda / ->	Creating and executing Proc and Lambda.
&:method_name / Method / method()	Using symbol's to_proc and method objects.
File.read / write / open	Reading and writing files.
File.exist? / directory? / basename / dirname / extname	Path manipulation and existence checks for files.
Dir.glob / mkdir / pwd / entries	Directory operations.
begin / rescue / ensure / raise	Basic syntax for exception handling.
Exception Classes / StandardError / RuntimeError	Major exception classes and defining custom exceptions.
puts / print / p / pp	Outputting to the console.
object.inspect / class / is_a? / respond_to?	Debugging objects and checking types.
class / initialize / attr_accessor	Defining classes, creating instances, and using accessors.
public / private / protected	Setting access control (visibility).
self / Class Methods / Instance Variables / Class Variables	Using self, instance variables, and class variables.
module / include / extend / mixin	Using modules and mixins.
Inheritance / super / override	Class inheritance and calling parent methods.
Comparable / <=> / ==	Defining and using comparison operators.

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