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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 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...
SQL select join: is it possible to prefix all columns as 'prefix.*'?
I'm wondering if this is possible in SQL. Say you have two tables A and B, and you do a select on table A and join on table B:
...
Test if something is not undefined in JavaScript
...
typeof:
var foo;
if (typeof foo == "undefined"){
//do stuff
}
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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...
Should import statements always be at the top of a module?
...odule with a unit test of the form:
if __name__ == '__main__':
import foo
aa = foo.xyz() # initiate something for the test
Secondly, you might have a requirement to conditionally import some different module at runtime.
if [condition]:
import foo as plugin_api
else:
impor...
What's the difference between echo, print, and print_r in PHP?
...used in an expression
e.g. print "Hello"
or, if ($expr && print "foo")
print_r()
Outputs a human-readable representation of any one value
Accepts not just strings but other types including arrays and objects, formatting them to be readable
Useful when debugging
May return its output as...
What is the maximum amount of RAM an app can use?
...ory management of the Android operating system so I hope for a quite detailed answer on that topic.
3 Answers
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How do I break out of a loop in Perl?
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Additional data (in case you have more questions):
FOO: {
for my $i ( @listone ){
for my $j ( @listtwo ){
if ( cond( $i,$j ) ){
last FOO; # --->
# |
} ...