From 1be8ac57abca95de2525c9b56fb51e9c8a802660 Mon Sep 17 00:00:00 2001 From: drbrain Date: Thu, 17 Jan 2013 00:08:53 +0000 Subject: * doc/syntax/control_expressions.rdoc: Added ? : ternary if git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- doc/syntax/control_expressions.rdoc | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'doc/syntax') diff --git a/doc/syntax/control_expressions.rdoc b/doc/syntax/control_expressions.rdoc index e3fc19d72d..0efc1668ad 100644 --- a/doc/syntax/control_expressions.rdoc +++ b/doc/syntax/control_expressions.rdoc @@ -86,6 +86,27 @@ side-effect is to cache a value into a local variable: The result value of an +if+ expression is the last value executed in the expression. +== Ternary if + +You may also write a if-then-else expression using ? and +:. This ternary if: + + input_type = gets =~ /hello/i ? "greeting" : "other" + +Is the same as this +if+ expression: + + input_type = + if gets =~ /hello/i + "greeting" + else + "other" + end + +While the ternary if is much shorter to write than the more verbose form, for +readability it is recommended that the ternary if is only used for simple +conditionals. Also, avoid using multiple ternary conditions in the same +expression as this can be confusing. + == +unless+ Expression The +unless+ expression is the opposite of the +if+ expression. If the value -- cgit v1.2.3