javascript string to boolean function.

gistfile1.js

function stringToBoolean( value ) {
    switch (typeof value) {
	   case "object":  
       case "string": return (/(true|1)/i).test(value);
       case "number": return !!value;
       case "boolean": return value;
       case "undefined": return null;
       default: return false;
    }
};