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Passing code to procedures and yield in Ruby
If you want to pass a block of code into a Ruby procedure, you can do so by passing in the code to a variable who's name you start with an & in the procedure definition; you can then run that code using the .call method on the received object. In some ways this is an indirect reference - in Ruby you can's simply assign code to a variable. You can also pass a curly brace defined block / closure into a procedure by specifying it as the piece of code that the procedure should jump to when it encounters a yield. There are examples of both of these syntaxes at [this location]. (written 2010-02-02 07:42:53) Associated topics are indexed under R104 - Ruby - Control Structures[2471] A short form of if ... then ... else - (2009-10-23) [2287] Learning to program in Ruby - examples of the programming basics - (2009-07-15) [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23) [1891] Ruby to access web services - (2008-11-16) [1887] Ruby Programming Course - Saturday and Sunday - (2008-11-16) [1870] What to do with a huge crop of apples - (2008-11-04) [1738] Clean code, jump free (Example in Lua) - (2008-08-06) [1696] Saying NOT in Perl, PHP, Python, Lua ... - (2008-07-04) [1587] Some Ruby programming examples from our course - (2008-03-21) [1582] Ruby, C, Java and more - getting out of loops - (2008-03-19) [1220] for loop - how it works (Perl, PHP, Java, C, etc) - (2007-06-06) [1163] A better alternative to cutting and pasting code - (2007-04-26) [995] Ruby's case - no break - (2006-12-17) [985] Equality in Ruby - == eql? and equal? - (2006-12-14) [962] Breaking a loop - Ruby and other languages - (2006-12-03) [960] 1st, 2nd, 3rd revisited in Ruby - (2006-12-02)
Some other Articles
Object Oriented Ruby - new examplesHandling unusual and error conditions - exceptions Ruby collections and strings - some new examples Direct access to object variable (attributes) in Ruby Passing code to procedures and yield in Ruby What are Ruby Symbols? Comparing floating point numbers - a word of caution and a solution Defining a static method - Java, Python and Ruby String to number conversion with error trapping in Ruby Neatly formatting results into a table |
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