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Blocks and yields in Ruby
...rguments, if needed. Consider this example method that demonstrates:
def foo(x)
puts "OK: called as foo(#{x.inspect})"
yield("A gift from foo!") if block_given?
end
foo(10)
# OK: called as foo(10)
foo(123) {|y| puts "BLOCK: #{y} How nice =)"}
# OK: called as foo(123)
# BLOCK: A gift from foo!...
Why use apparently meaningless do-while and if-else statements in macros?
...lon after the (void)0. A dangling else in that case (e.g. if (cond) if (1) foo() else (void)0 else { /* dangling else body */ }) triggers a compilation error. Here's a live example demonstrating it
– Chris Kline
Jul 27 '15 at 11:07
...
Pass entire form as data in jQuery Ajax function
...select> options are serialized under the same key, e.g.
<select id="foo" name="foo" multiple="multiple">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
</select>
will result in a query s...
Join vs. sub-query
...t-Fields
SELECT moo, (SELECT roger FROM wilco WHERE moo = me) AS bar FROM foo
Be aware that a sub-query is executed for every resulting row from foo.
Avoid this if possible; it may drastically slow down your query on huge datasets. However, if the sub-query has no reference to foo it can be optim...
Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?
...rame #00 pc 0000841e /data/local/ndk-tests/crasher : Routine zoo in /tmp/foo/crasher/jni/zoo.c:13
Stack frame #01 pc 000083fe /data/local/ndk-tests/crasher : Routine bar in /tmp/foo/crasher/jni/bar.c:5
Stack frame #02 pc 000083f6 /data/local/ndk-tests/crasher : Routine my_comparison in /tm...
Why should I avoid using Properties in C#?
...pler to read. The Law of Demeter is all very well in theory, but sometimes foo.Name.Length really is the right thing to use...)
(And no, automatically implemented properties don't really change any of this.)
This is slightly like the arguments against using extension methods - I can understand the...
Managing constructors with many parameters in Java
...ng house, String street, String town, String postcode, String country, int foo, double bar) {
super(String house, String street, String town, String postcode, String country);
this.foo = foo;
this.bar = bar;
then you could instead have:
MyClass(Address homeAddress, int foo, double bar) {...
What is the exact problem with multiple inheritance?
... 12 ... "speak" ... 4 byte function pointer
class B:
at offset 0 ... "foo" ... 2 byte short field
at offset 2 ... 2 bytes of alignment padding
at offset 4 ... "bar" ... 4 byte array pointer
at offset 8 ... "baz" ... 4 byte function pointer
When the compiler generates machine code ...
subtle differences between JavaScript and Lua [closed]
...the for loop creates new local variables for each loop variable.
local i='foo'
for i=1,10 do
-- "i" here is not the local "i" declared above
...
end
print(i) -- prints 'foo'
The above code is equivalent to:
local i='foo'
do
local _i=1
while _i<10 do
local i=_i
...
_i=_i+1
...
How to pass parameters correctly?
... be visible to the caller, then you should pass by lvalue reference:
void foo(my_class& obj)
{
// Modify obj here...
}
If your function does not need to modify the original object, and does not need to create a copy of it (in other words, it only needs to observe its state), then you shou...