String.lstrip!

Signature

string.lstrip!    #=> string or nil

String.lstrip! is the in-place edit version of
String.lstrip.
string.lstrip! returns string with leading whitespace removed from string
or it returns nil if no leading whitespace was found.

Examples

str = "\r\n\t foo bar"    #=> "\r\n\t foo bar"
str.lstrip!               #=> "foo bar"
str == "\r\n\t foo bar"   #=> false
str == "foo bar"          #=> true
str.lstrip!               #=> nil

Documentation Reference

www.ruby-doc.org : String.lstrip!