48 lines
1.2 KiB
Markdown
48 lines
1.2 KiB
Markdown
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---
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title: Ruby String Operations
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---
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Both concatenation and multiplication can be performed on strings.
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## Concatenation:
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* Strings can be joined together using any of the following methods:
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* `+` operator
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* `<<` operator
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* `.concat` method
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```ruby
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"Hello" + " World" + "!" #=> Hello World!
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```
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```ruby
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"Hello" << " World!" #=> Hello World!
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```
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```ruby
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string1 = "Hello"
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string2 = " World!"
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string1.concat(string2) #=> Hello World!
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```
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## Multiplication:
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* Strings can be multiplied by an integer value using the `*` operator.
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```ruby
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"Hello" * 3 #=> HelloHelloHello
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```
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## Replacing a substring
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* We can search for sub-strings or use Regex for searching and replacing character within a string.
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```ruby
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"Hey mom, look at this string".sub('mom', 'dad') #=> Hey dad, look at this string
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```
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## Comparison:
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* Strings can be compared, returns -1, 0, +1 or nil depending on whether string is less than, equal to, or greater than other_string.
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```ruby
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"abcdef" <=> "abcde" #=> 1
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"abcdef" <=> "abcdef" #=> 0
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"abcdef" <=> "abcdefg" #=> -1
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"abcdef" <=> "ABCDEF" #=> 1
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```
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