freeCodeCamp/guide/english/ruby/ruby-string-operations/index.md

title
Ruby String Operations

Both concatenation and multiplication can be performed on strings.

Concatenation:

• Strings can be joined together using any of the following methods:

  • + operator
  • << operator
  • .concat method

  "Hello" + " World" + "!"  #=> Hello World!
  

  "Hello" << " World!" #=> Hello World!
  

  string1 = "Hello"
  string2 = " World!"
  string1.concat(string2) #=> Hello World!
  

Multiplication:

• Strings can be multiplied by an integer value using the * operator.

  "Hello" * 3 #=> HelloHelloHello
  

Replacing a substring

•   We can search for sub-strings or use Regex for searching and replacing character within a string.

  "Hey mom, look at this string".sub('mom', 'dad') #=> Hey dad, look at this string
  

Comparison:

• Strings can be compared, returns -1, 0, +1 or nil depending on whether string is less than, equal to, or greater than other_string.

"abcdef" <=> "abcde"     #=> 1
"abcdef" <=> "abcdef"    #=> 0
"abcdef" <=> "abcdefg"   #=> -1
"abcdef" <=> "ABCDEF"    #=> 1