What’s the differnce between
TypeError: ... is undefined
and
ReferenceError: ... is not defined
?
What’s the differnce between TypeError: … is undefined and ReferenceError: … is not defined
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What’s the differnce between
TypeError: ... is undefined
and
ReferenceError: ... is not defined
?
A
ReferenceErroroccurs when you try to use a variable that doesn’t exist at all.A
TypeErroroccurs when the variable exists, but the operation you’re trying to perform is not appropriate for the type of value it contains. In the case where the detailed message says “is not defined”, this can occur if you have a variable whose value is the specialundefinedvalue, and you try to access a property of it.See http://javascriptweblog.wordpress.com/2010/08/16/understanding-undefined-and-preventing-referenceerrors/ for some discussion related to this.