How should I check whether a string starts or ends with a given string? There doesn't seem to be any built-in methods available (or maybe it's just the IDE I'm using that isn't having it show up: RDE)
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2 Answers
There are built in methods:
"String".start_with? "S" # true "String".end_with? "4" # false 
7 Comments
Barmar
I think they need to give these functions more descriptive names. :)
Joshua Pinter
God bless Matz and Ruby. Although, I think they should be named
starts_with? and ends_with?.
DavidC
@Josh Pinter start_with? is consistent with other functions like eql? and include? - I think of it as a question "Does the string start_with?" rather than a statement "The string starts_with"
Joshua Pinter
Fair enough, but if you think of how you actually use it when writing code, it's exactly like your latter statement, i.e.
"The string".starts_with?Joshua Pinter
@DavidC And for conditionals, you would never say something like "If does the string start with?", you'd say "If the string starts with?".
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string.start_with?("substring") string.end_with?("substring") Returns true or false
Source:
http://ruby-doc.org//core-2.2.0/String.html#method-i-start_with-3F
http://ruby-doc.org//core-2.2.0/String.html#method-i-end_with-3F