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POI've Heard Global Variables Are Bad, What Alternative Solution Should I Use?
 

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    <p>I've read all over the place that <a href="http://c2.com/cgi/wiki?GlobalVariablesAreBad" rel="noreferrer">global variables are bad</a> and alternatives should be used. In Javascript specifically, what solution should I choose.</p> <p>I'm thinking of a function, that when fed two arguments (<code>function globalVariables(Variable,Value)</code>) looks if Variable exists in a local array and if it does set it's value to <code>Value</code>, else, <code>Variable</code> and <code>Value</code> are appended. If the function is called without arguments (<code>function globalVariables()</code>) it returns the array. Perhaps if the function is fired with just one argument (<code>function globalVariables(Variable)</code>) it returns the value of <code>Variable</code> in the array.</p> <p>What do you think? I'd like to hear your alternative solutions and arguments for using global variables.</p> <h1>How you would use <code>globalVariables();</code></h1> <pre><code>function append(){ globalVariables("variable1","value1"); //globalVariables() would append variable1 to it's local array. }; function retrieve(){ var localVariable1 = globalVariables("variable1"); //globalVariables() would return "value1". }; function retrieveAll(){ var localVariable1 = globalVariables(); //globalVariables() would return the globalVariable()'s entire, local [persistently stored between calls] array. }; function set(){ globalVariables("variable1","value2"); //globalVariables() would set variable1 to "value2". }; </code></pre> <p><strong>Is this a <a href="http://c2.com/cgi/wiki?SingletonPattern" rel="noreferrer">Singleton Pattern</a> BTW?</strong></p> <p>In this specific scenario a function may set a variable at one point in time, and much later another function, maybe when a user submits a form, will need to get that variable. Therefore the first function couldn't pass the variable as an argument to the later function as it would never be called from the first.</p> <p>Thank you, I appreciate all your help!</p>
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    1. COI don't think you quite understand why they are bad
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    2. CO@Yacoby: I think I do [Lee's answer explains a lot] but if you feel otherwise then please elaborate. What solution should I use in this scenario?
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    3. COI'd have to agree with @Yacoby here. You are kind of reinventing global variables in your example, hence getting you back to step one of "global variables are bad".
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