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What is the purpose of the var keyword and when should I use it (or omit it)?
...l scope (at which point it will create it):
// These are both globals
var foo = 1;
bar = 2;
function()
{
var foo = 1; // Local
bar = 2; // Global
// Execute an anonymous function
(function()
{
var wibble = 1; // Local
foo = 2; // Inherits from scope above (...
When is a function too long? [closed]
...er of times I've stumbled across someone's code with a line like: // fetch Foo's credentials where Bar is "uncomplete". That's almost certainly a function name right there and should be decoupled. Probably wants to be refactored into something like: Foo.fetchCredentialWhereBarUncomplete()
...
Is there an advantage to use a Synchronized Method instead of a Synchronized Block?
...thod). For example, these are semantically equivalent:
synchronized void foo() {
...
}
void foo() {
synchronized (this) {
...
}
}
The latter is more flexible since it can compete for the associated lock of any object, often a member variable. It's also more granular because you...
How default .equals and .hashCode will work for my classes?
...wełDyda: The default behavior is generally correct for mutable types. If Foo and Bar are references to two different instances of a mutable type, and there exists a method (e.g. SomeMutatingMethod) such that Foo.SomeMutatingMethod() does not affect Bar the same way it does Foo, that difference sho...
Can I set variables to undefined or pass undefined as an argument?
...
@Hortitude: That's point (4). I generally wouldn't typeof foo=='undefined'; it tends to be used for (4a) global-sniffing, in which case I'd prefer to be explicit and say 'foo' in window, or (4b) testing against the undefined-value itself, in which case I'd prefer to be readable and ...
What is the syntax to insert one list into another list in python?
...
foo = [1, 2, 3]
bar = [4, 5, 6]
foo.append(bar) --> [1, 2, 3, [4, 5, 6]]
foo.extend(bar) --> [1, 2, 3, 4, 5, 6]
http://docs.python.org/tutorial/datastructures.html
...
What do 3 dots next to a parameter type mean in Java?
...5. It means that function can receive multiple String arguments:
myMethod("foo", "bar");
myMethod("foo", "bar", "baz");
myMethod(new String[]{"foo", "var", "baz"}); // you can even pass an array
Then, you can use the String var as an array:
public void myMethod(String... strings){
for(String wh...
Adding console.log to every function automatically
...Class {
a() {
this.aa = 1;
}
b() {
this.bb = 1;
}
}
const foo = new TestClass()
foo.a() // nothing get logged
we can replace our class instantiation with a Proxy that overrides each property of this class. so:
class TestClass {
a() {
this.aa = 1;
}
b() {
this.bb = 1...
Is there a function in python to split a word into a list? [duplicate]
...
The list function will do this
>>> list('foo')
['f', 'o', 'o']
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How to select multiple rows filled with constants?
...ostgreSQL you may want to try this syntax
SELECT constants FROM (VALUES ('foo@gmail.com'), ('bar@gmail.com'), ('baz@gmail.com')) AS MyTable(constants)
You can also view an SQL Fiddle here: http://www.sqlfiddle.com/#!17/9eecb/34703/0
...