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Ruby v Perl - interpollating variables
When printing in Perl, you can drop a variable into a double quoted string ant it will be interpretter for you: "--- $number ---"If you want to perform an operation on the variable, though, it's not as easy - you have to come out of the double quoted string, do the calculation, then start another string: "--- ",$number + 1," ---"In Ruby, variable names do NOT start with a $ so you can't simply drop them in to your double quoted string. Instead, you can write #{expression} within the double quotes and that gives you ... "--- #{number + 1} ---"And that's fabulous - it gives you the ability to write any expresion you want, or just a simple variable, with a double quoted string and have the same simple syntax for both. (written 2006-12-15 04:57:25) Associated topics are indexed under P205 - Perl - Initial String Handling[1860] Seven new intermediate Perl examples - (2008-10-30) [1849] String matching in Perl with Regular Expressions - (2008-10-20) [1608] Underlining in Perl and Python - the x and * operator in use - (2008-04-12) [1195] Regular Express Primer - (2007-05-20) [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07) [324] The backtick operator in Python and Perl - (2005-05-25) [254] x operator in Perl - (2005-03-22) [31] Here documents - (2004-08-28) R109 - Ruby - Strings and Regular Expressions [2623] Object Oriented Ruby - new examples - (2010-02-03) [2621] Ruby collections and strings - some new examples - (2010-02-03) [2614] Neatly formatting results into a table - (2010-02-01) [2608] Search and replace in Ruby - Ruby Regular Expressions - (2010-01-31) [2295] The dog is not in trouble - (2009-07-17) [2293] Regular Expressions in Ruby - (2009-07-16) [1891] Ruby to access web services - (2008-11-16) [1887] Ruby Programming Course - Saturday and Sunday - (2008-11-16) [1875] What are exceptions - Python based answer - (2008-11-08) [1588] String interpretation in Ruby - (2008-03-21) [1305] Regular expressions made easy - building from components - (2007-08-16) [986] puts - opposite of chomp in Ruby - (2006-12-15)
Some other Articles
Adding a member to a Hash in RubyRuby - Totally Topical Melksham Quiz You should think you're first in a hotel room Ruby v Perl - interpollating variables Equality in Ruby - == eql? and equal? Cardinal numbers and magic numbers Blessing in Perl / Member variable in Ruby Notes from the white board |
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