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PODictionary for missing value
 

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    <p>Here is the code</p> <pre><code>converter = { 'SIToImperial' : { 'cm' : function(value) {return value * convertRatioImperial[0];}, 'm' : function(value) {return value * convertRatioImperial[1];}, 'km' : function(value) {return value * convertRatioImperial[2];}, 'g' : function(value) {return value * convertRatioImperial[3];}, 'kg' : function(value) {return value * convertRatioImperial[4];}, 't' : function(value) {return value * convertRatioImperial[5];}, 'mL' : function(value) {return value * convertRatioImperial[6];}, 'L' : function(value) {return value * convertRatioImperial[7];}, 'm3' : function(value) {return value * convertRatioImperial[8];}, 'kWh' : function(value) {return value;}, 'nb' : function(value) {return value;}, 'undefined': function(value) {return 'Not Found';} } } </code></pre> <p>It is clear that my line 'undefined'.... does not work like I want it to.</p> <p>I would like that when converter["SIToImperial"][units] is called with an 'units' not listed in the properties. Exemple : converter["SIToImperial"]['oz']. It should return the undefined line IE 'Not Found'.</p> <p>Could someone help me out I have tried various ways but I'm still not enough familiar with dictionnaries to get it working properly.</p> <p>Update :</p> <pre><code>//Generalized conversion function function convert(value,valueUnit,system, toSI) { var result; //From SI to Imp/U if(!toSI) { result = converter.guardian('SITo'+system,valueUnit,value); } else if(toSI)//To SI from Imp/US { result = converter.guardian(system+'ToSI',valueUnit,value); } return result; }; </code></pre> <p>and </p> <pre><code>converter = { guardian : function (system,units,value) {var label = this[system][units]; if(typeof(label) === 'undefined') {return "Not Found";} else {return label(value);}}, 'SIToImperial' : { 'cm' : function(value) {return value * convertRatioImperial[0];}, 'm' : function(value) {return value * convertRatioImperial[1];}, 'km' : function(value) {return value * convertRatioImperial[2];}, 'g' : function(value) {return value * convertRatioImperial[3];}, 'kg' : function(value) {return value * convertRatioImperial[4];}, 't' : function(value) {return value * convertRatioImperial[5];}, 'mL' : function(value) {return value * convertRatioImperial[6];}, 'L' : function(value) {return value * convertRatioImperial[7];}, 'm3' : function(value) {return value * convertRatioImperial[8];}, 'kWh' : function(value) {return value;}, 'nb' : function(value) {return value;} } } </code></pre>
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    1. COWhy don't you make SIToImperial function that takes this as parameter - it even makes more sense to call converter.SIToImperial('cm', 2) then converter['SIToImperial']['cm'](2) or converter.SIToImperial['cm'](2) or converter.SIToImperial.cm(2)
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    2. COI have a wrapping function over it, because I wrap from View to Model and from Model to View. When I call the wrapper it look like this convertToView(value,unit) or convertToModel(value,unit)
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