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this Reference unchangeable??

 
Dolfandave Uyemura
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Hi,
I heard/read something in regards to the 'this' reference. I read about using 'this' and understand its use but the question pertained to whether something was unchangeable. Is anyone familiar with the unchangeable part? What is unchangeable? I understand the use of 'this' but couldn't recall seeing anything to the latter. Thanks in advance.
DDAVE
 
Thomas Paul
mister krabs
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"this" is a readonly variable and can't be changed.
 
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