string_methods.md

String Length

"Turing".length or "Turing".size
#6

Checking if string is empty

"Turing".size == 0
#true

"".empty?
#true

Reversing string

"Turing".reverse
# “gniruT”

Upcasing string

"Turing".upcase
# “TURING”

Downcasing string

"TURING".downcase
# “turing”

Captializing string

"turing".capitalize
# “Turing”

If a string contains another string

"Turing".include? "z"
# equals to false because there is no z in Turing

Returns a copy of string with all occurrences of pattern substituted for the second argument

"Turing".gsub!(/[ri]/, "z")
# Tuzzng

Transform string to integer

"1".to_i
#1

Transform string to symbol

"turing".to_sym or "turing".intern
#:turing

Transform symbol to string

:turing.to_s
#"turing"

Convert a string to an array of characters

_{can pass argument into this method to specify a different separator}

"turing".split
#['t', 'u', 'r', 'i', 'n', 'g']

Convert an array to a string

turing_array = ['t', 'u', 'r', 'i', 'n', 'g']
turing_array.join
# "turing"

Iterate Over Characters Of a String in Ruby

string = "turing"
string.each_char { |letter| puts letter }
#t
#u
#r
#i
#n
#g

String interpolation

_{allows you to combine strings together}

name = "Turing"
puts "#{name} is life!"
# "Turing is life!"

Padding a string

_{takes two arguments: first argument is length of final string second argument is what string will be padded with}

binary_string = "1111"
binary_string.rjust(7, "0")
# "0001111"

_{if you want to pad to the right you can use ljust}

binary_string = "1111"
binary_string.ljust(7, "0")
# "1111000"