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You have already activated X, but your Gemfile requires Y
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edited May 26 '14 at 17:02
Andrew Marshall
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Should a retrieval method return 'null' or throw an exception when it can't produce the return value
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Getting jQuery to recognise .change() in IE
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edited Apr 17 '12 at 15:08
Tim Cooper
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Overriding == operator. How to compare to null? [duplicate]
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Use object.ReferenceEquals(person1, null) instead of the == operator:
public static bool operator ==(Person person1, Person person2)
{
if (object.ReferenceEquals(person1, null))
{
return object.ReferenceEquals(person2, null);
}
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Selecting only first-level elements in jquery
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How to set the prototype of a JavaScript object that has already been instantiated?
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