Decision tables: Difference between revisions
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For large numbers of rules and few actions, J's native support of sparse arrays might provide a performance advantage, particularly in space. A minor note about the implementation here: the verb (function) <tt>troubleshoot</tt> is generalized, and reusable on any set of rule table, questions, and suggested actions. The default is to use those given in the printer troubleshooting table. |
For large numbers of rules and few actions, J's native support of sparse arrays might provide a performance advantage, particularly in space. A minor note about the implementation here: the verb (function) <tt>troubleshoot</tt> is generalized, and reusable on any set of rule table, questions, and suggested actions. The default is to use those given in the printer troubleshooting table. |
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=={{header|JavaScript}}== |
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Since this is an interactive web page, results can't be listed. See http://jsfiddle.net/rGP6C/1/ for a live demo. |
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<lang javascript><html> |
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<head></head> |
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<body> |
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<form id="form"></form> |
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<br/>Possible solutions: |
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<ul id="ul"></ul> |
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</body> |
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<script src="http://code.jquery.com/jquery-latest.min.js"></script> |
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<script type="text/javascript"> |
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var questions = [ |
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{ bools:[1,1,1,1,0,0,0,0], text:"Printer does not print" }, |
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{ bools:[1,1,0,0,1,1,0,0], text:"A red light is flashing" }, |
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{ bools:[1,0,1,0,1,0,1,0], text:"Printer is unrecognized" }, |
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]; |
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var answers = [ |
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{ bools:[0,0,1,0,0,0,0,0], text:"Check the power cable" }, |
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{ bools:[1,0,1,0,0,0,0,0], text:"Check the printer-computer cable" }, |
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{ bools:[1,0,1,0,1,0,1,0], text:"Ensure printer software is installed" }, |
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{ bools:[1,1,0,0,1,1,0,0], text:"Check/replace ink" }, |
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{ bools:[0,1,0,1,0,0,0,0], text:"Check for paper jam" }, |
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] |
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$(document).ready(function() { |
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// Init form with questions. "Value" is a descending power of 2. |
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var value = questions[0].bools.length; |
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for (var i = 0; i < questions.length; i++) { |
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value /= 2; |
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var el = '<br /><input type="checkbox" value="' + value + '">' + questions[i].text; |
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$("#form").append(el); |
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} |
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// Respond to a checkbox action. |
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$('input:checkbox').change(function() { |
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// Figure out which combination of checkboxes the user selected. |
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var sum = 0; |
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$('input:checkbox:checked').each(function () { |
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sum += Number(this.value); |
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}); |
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// Translate sum into an index (column #) into bools. |
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var index = questions[0].bools.length - sum - 1; |
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// Clear the answers. |
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$('#ul').html(''); |
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// Add appropriate answers. |
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for (var i = 0; i < answers.length; i++) { |
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if (answers[i].bools[index]) { |
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$('#ul').append('<li>' + answers[i].text + '</li>') |
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} |
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} |
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}); |
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}); |
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</script> |
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</html></lang> |
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=={{header|Perl 6}}== |
=={{header|Perl 6}}== |
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