part_2_string_operations.md

String Methods

.length returns the length if the string.
.reverse returns the string in reverse order. It does not modify the original string. .downcase and .upcase is used to return string in all lowercase and all uppercase respectively.
.capitalize capitalizes the first letter in the sentence and changes rest to lowercase.

puts "Your_Name".length
string_variable = "hello there!"
puts string_variable.reverse 

Note: Multiple methods can be called in single line, one after the other. If a method is ends with exclamation mark(!), it modifies the original value of the variable.

puts string_variable.upcase.reverse
string_variable.downcase!
puts string_variable

.include? "substring" checks if the variable has the substring. It returns boolean.

if input.include? "hello"
    puts input
end

Note: As a general rule, Ruby methods that end with ? evaluate to the boolean values true or false.

.gsub stands for global substitution. It substitutes a substring with another.
.split method returns all words in a string as an array. If text is given as parameter, it will divide the string wherever it sees that bit of text. The test is called delimiter.
.to_s is used to convert other data-type variables into string.

user_input.gsub!(/s/,"th")
words = text.split(" ")
num = 8
puts "The number is "+num.to_s

To access single character in a string, bracket notation is used. The index is mentioned inside square brackets.

puts "Hello There"[4] # o

String Interpolation

monkey = "Curious"
print "I took #{monkey} to zoo"

Output will be: I took Curious to zoo Notice, use double apostrophe(") to print the interpolated statement.