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How do I create and access the global variables in Groovy?
... several methods that need to share the same variable, use a field:
class Foo {
def a;
def foo() {
a = 1;
}
def bar() {
print a;
}
}
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Node.js - use of module.exports as a constructor
...My module
function MyObject(bar) {
this.bar = bar;
}
MyObject.prototype.foo = function foo() {
console.log(this.bar);
};
module.exports = MyObject;
// In another module:
var MyObjectOrSomeCleverName = require("./my_object.js");
var my_obj_instance = new MyObjectOrSomeCleverName("foobar");
my_...
Keystore change passwords
...KeyException: Cannot recover key Any suggestions?
– Foo
Jun 21 '15 at 12:54
@Foo did you ever figure out that issue? ...
Setting variable to NULL after free
...he call to free, it's not only not best practice, it's wrong. For example: foo* bar=getFoo(); /*more_code*/ free(bar); /*more_code*/ return bar != NULL;. Here, setting bar to NULL after the call to free will cause the function to think it never had a bar and return the wrong value!
...
PHP expresses two different strings to be the same [duplicate]
...e, typeof operator always returns a string, so you could just use
typeof foo == 'string' instead of typeof foo === 'string' with no harm.
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compareTo() vs. equals()
...
A difference is that "foo".equals((String)null) returns false while "foo".compareTo((String)null) == 0 throws a NullPointerException. So they are not always interchangeable even for Strings.
...
Why use Abstract Base Classes in Python?
...ass Base(object):
__metaclass__ = ABCMeta
@abstractmethod
def foo(self):
pass
@abstractmethod
def bar(self):
pass
# python3
class Base(object, metaclass=ABCMeta):
@abstractmethod
def foo(self):
pass
@abstractmethod
def bar(self):
...
How can I determine the current line number in JavaScript?
...some marks.
Here is a quick example (yes, it's messed a little).
function foo()
{
alert(line(1));
var a;
var b;
alert(line(2));
}
foo();
function line(mark)
{
var token = 'line\\(' + mark + '\\)';
var m = line.caller.toString().match(
new Re...
How do you check in python whether a string contains only numbers?
... I had no idea that method existed. I've always done try: assert str(int(foo)) == foo; except (AssertionError,ValueError): #handle and it felt ugly as sin. Thanks!
– Adam Smith
Jan 27 '14 at 18:23
...
Why is lazy evaluation useful?
...ges let you reason about function definitions using equational reasoning.
foo x = x + 3
Unfortunately in a non-lazy setting, more statements fail to return than in a lazy setting, so this is less useful in languages like ML. But in a lazy language you can safely reason about equality.
Secondly, ...