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Javascript converting "null" to string

tjgquicken
tjgquicken asked
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Last Modified: 2012-05-06
I'm working on a Javascript program and I'm trying to figure out the best way to do the following:
I have a string and I want to concatenate it with another variable. The problem is that if the other variable is null, what I wind up with is my first string concatenated with the word "null". Instead, I want to have my first string concatenated with an empty string. Is there any way to change the default Javascript behavior, maybe by changing the toString function or something in String.prototype, so that "casting" a null to a String results in an empty string? Thanks.
var o = { a: 'string', b: null }
document.writeln(o.a + o.b);                     // prints "stringnull", i want it to just print "string"

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