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Common elements in two lists
...ng the method
"retainAll". This method will remove all unmatched elements from the list to
which it applies.
Ex.: list.retainAll(list1);
In this case from the list, all the elements which are not in list1 will be
removed and only those will be remaining which are common between list and
list1....
Shell - Write variable contents to a file
... printf is also good if you have newlines in the variable string, like from a triple quote or heredoc. echo doesn't handle the newlines well.
– beeflobill
Jun 27 '18 at 22:19
...
What is a callback?
...ge
Parent Peter = new Parent();
Child Johny = new Child();
// Tell Johny from where to obtain info
Johny.GetMeInformation = Peter.Read;
Johny.ObtainInfo(); // here Johny 'asks' Peter to read
Links
more details for C#.
...
Optimising Android application before release [closed]
...e more often the garbage collector will need to run, stopping your process from doing anything else for relatively long periods of time, such as 100ms or so.
The best tool I know for this is the Allocation Tracker included in DDMS.
Not only GC can have an impact on the user experience, but superf...
Scala: Abstract types vs generics
...part of the bound.
(i.e. Scala supports F-bounded polymorphism)
(Note, from Peter Canning, William Cook, Walter Hill, Walter Olthoff paper:
Bounded quantification was introduced by Cardelli and Wegner as a means of typing functions that operate uniformly over all subtypes of a given type.
They d...
Create a “with” block on several context managers? [duplicate]
...n 2.6 and 2.7.
In Python 2.6 and below, you can use contextlib.nested:
from contextlib import nested
with nested(A(), B(), C()) as (X, Y, Z):
do_something()
is equivalent to:
m1, m2, m3 = A(), B(), C()
with m1 as X:
with m2 as Y:
with m3 as Z:
do_something()
Not...
How to get browser width using JavaScript code?
...
From W3schools and its cross browser back to the dark ages of IE!
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var w = window.innerWidth
|| document.documentElement.clientWid...
Have bash script answer interactive prompts [duplicate]
...e things is called Expect.
You might also get away with just piping input from yes.
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How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
..., each instance of a ## preprocessing token
in the replacement list (not from an argument) is deleted and the preceding preprocessing
token is concatenated with the following preprocessing token.
So, the replacement list contains x followed by ## and also ## followed by y; so we have:
mine ##...
Difference between if () { } and if () : endif;
...regardless of which tool we may need to use. Specially true for PHP, which from times to times you need to see using the most simplistic editors.
– cregox
Dec 15 '14 at 17:13
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