>>> def f():
... type(x)
... x = 10
...
>>> f()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in f
UnboundLocalError: local variable 'x' referenced before assignment
irb(main):010:0> def f()
irb(main):011:1> x.class
irb(main):012:1> x = 10
irb(main):013:1> end
=> nil
irb(main):014:0> f()
NameError: undefined local variable or method `x' for main:Object
from (irb):11:in `f'
from (irb):14:in `evaluate'
from org/jruby/RubyKernel.java:1101:in `eval'
from org/jruby/RubyKernel.java:1501:in `loop'
from org/jruby/RubyKernel.java:1264:in `catch'
from org/jruby/RubyKernel.java:1264:in `catch'
from C:/jruby-1.7.12/bin/jirb_swing:53:in `(root)'
public class Test {
public void f() {
boolean isInt = x instanceof Integer;
Integer x = 10;
}
}
>javac Test.java
Test.java:3: error: cannot find symbol
boolean isInt = x instanceof Integer;
^
symbol: variable x
location: class Test
1 error
Oh no, it's now in line with just about every other lexically scoped language.
