Enforced immutability: Difference between revisions
Content added Content deleted
m (variable trait "is readonly" is not valid anymore) |
(→{{header|Ruby}}: Added comment about freezing strings in Ruby > 2.0) |
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msg2 = msg |
msg2 = msg |
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# |
# The object is frozen, not the variable. |
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msg = "hello world" # A new object was assigned to the variable. |
msg = "hello world" # A new object was assigned to the variable. |
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puts msg.frozen? #=> false |
puts msg.frozen? #=> false |
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puts msg2.frozen? #=> true</lang> |
puts msg2.frozen? #=> true</lang> |
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Since Ruby version 2.1 freezing strings can give a performance boost. |
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There is no way to unfreeze a frozen object. |
There is no way to unfreeze a frozen object. |
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The freeze can not be canceled but the object of approximately the same contents not to freeze up can be gotten if using Object#dup. |
The freeze can not be canceled but the object of approximately the same contents not to freeze up can be gotten if using Object#dup. |
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