Essential Books

String Substitution

suggest change 
p "This is %s" % "foo"
# => "This is foo"

p "%s %s %s" % ["foo", "bar", "baz"]
# => "foo bar baz"

p "%{foo} == %{foo}" % {:foo => "foo" }
# => "foo == foo"

See String % docs and Kernel::sprintf for more details.

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Strings:
* Strings
* Difference between single-quoted and double-quoted String literals
* Creating a String
* Case manipulation
* Splitting a String
* String concatenation
* Positioning strings
* Joining Strings
* String starts with
* String interpolation
* String ends with
* Formatted strings
* String character replacements
* Understanding the data in a string
* String Substitution
* Multiline strings
Table Of Contents