Symbols in Ruby Symbols are an additional data type, similar to strings, but different. str = ” “ strings are wrapped in quotes. Symbol = : symbols begin with a colon. Ex: str = “hello # the string sym = :hello # the symbol p str.length # => 5 p sym.length # => 5 p str[1] # => “e” p sym[1] # => “e” p str == sym # => false #Lesson…A string is DIFFERENT from a symbol! Strings are mutable (can be changed, or mutated). Symbols are immutable (can never be changed, or mutated). Because strings are mutable, they are always stored in a new memory location (even if…

More Common Enumerable’s .all?–return ‘true’ when all elements result in true when passed into the block. Ex: p [2,4,6].all? { |el| el.even? } # =>(returns) true Ex: p [2,3,6].all? { |el| el.even? } # => false .any?–return ‘true’ when at least one element results in true when passed into the block Ex: p [3,4,7].any? { |el| el.even? } # => true Ex: p [3,5,7].any? { |el| el.even? } # => false .none?–return ‘true’ when no elements result in true when passed into the block. Ex: p[1,3,5].none? { |el| el.even? } # => true Ex: p[1,4,5].none? { |el| el.even? } # => false .one?–return ‘true’ when exactly one element results in…

array.map–allows us to take in an array and modify it a certain way. (Returns a new array!) (This can let us skip the step of shoveling a desired result into a new array[].) arr = [“a”, “b”, “c”, “d”] Old way: new_arr = [ ] arr.each { |ele| new_arr << ele.upcase + “!” } print new_arr puts Output: [“A!”, “B!”, “C!”, “D!”] New way with .map: arr = [“a”, “b”, “c”, “d”] #(.map is still an enumerable, so when we call it we have to pass in a block.) #This block accepts the element as well, like .each. new_arr = arr.map { |ele| ele.upcase + “!” } #In the block…