Integer methods
1.methods.sort
String methods
“”.methods.sort
String Interpolation
a = 1
b = 4
puts “The number #{a} is less than #{b}” => The number 1 is less than 4
def string_length_interpolater(incoming_string)
“The string you just gave me has a length of #{incoming_string.length}”
end
Search in a String
“[Luke:] I can’t believe it. [Yoda:] That is why you fail.”.include?(‘Yoda’)
Other:
- .start_with?(“Ruby”)
- .end_with?()
- .index()
- upcase
- downcase
- swapcase
- split(‘ ‘)
- concat() or +
- sub(“findText||RegEx”, “replaceText”) – only replaces first occurrence
- gsub(“findText||RegEx”, “replaceText”) – replaces all occurrences (ex gsub(/[A-Z]/,’0′))
Find a substring using RegEx
‘RubyMonk Is Pretty Brilliant’.match(/ ./) => I
Adding to array
.push or <<
Transform Array
[1, 2, 3, 4, 5].map { |i| i*3} * note curly brace
Filter elements of an Array
[1,2,3,4,5,6].select {|number| number % 2 == 0} * note curly brace
Blocks
addition = lambda {|a, b| return a + b }
puts addition.call(5, 6)
