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How do I increase the scrollback buffer in a running screen session?
...defscrollback and not scrollback (def stand for default)
What you need to know is if the file is not created ! You create it !
> cd ~ && vim .screenrc
And you add defscrollback 1000000 to it!
Or in one command
> echo "defscrollback 1000000" >> .screenrc
(if not created already)...
Why does this Java code compile?
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int x = x + 1;
first we need to compute x+1 but the value of x is not known so you get an error (the compiler knows that the value of x is not known)
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String concatenation vs. string substitution in Python
... large boosts in performance..."
If performance matters, this is good to know.
However, performance problems I've seen have never come down to string operations. I've generally gotten in trouble with I/O, sorting and O(n2) operations being the bottlenecks.
Until string operations are the perfor...
How does having a dynamic variable affect performance?
... that represents "there's going to be a dynamic call to Foo here".
OK, so now that you've got the call site, how does the invocation work?
The call site is part of the Dynamic Language Runtime. The DLR says "hmm, someone is attempting to do a dynamic invocation of a method foo on this here object....
What does “fragment” mean in ANTLR?
...with you that this is a meaningful example but (imo) only for who already knows what the fragment keyword means. I find it somewhat misleading for someone who is trying to figure out the correct use of fragments for the first time.
– BlackBrain
Dec 6 '18 at 17:...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
.../a/11227902/1001643
Compilers typically don't have enough information to know which branches will alias and whether those aliases will be significant. However, that information can be determined at runtime with tools such as Cachegrind and VTune.
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What does “program to interfaces, not implementations” mean?
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Interfaces are just contracts or signatures and they don't know
anything about implementations.
Coding against interface means, the client code always holds an Interface object which is supplied by a factory. Any instance returned by the factory would be of type Interface which an...
Mixin vs inheritance
...med "ColorAndDimension", which adds a color property and width and height.
Now, you could add ColorAndDimension to a, say, Shape class, a Sprite class, a Car class, etc. And they will all have the same interface (say get/setColor, get/setHeight/Width, etc.)
So, in the generic case a mixin IS inherit...
Best practice for storing and protecting private API keys in applications [closed]
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@EricLafortune Is it now possible to use the Android Keystore system to securely store the keys? ( developer.android.com/training/articles/keystore.html )
– David Thomas
Apr 29 '16 at 6:09
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SyntaxError: Use of const in strict mode
...onst declarations without the --harmony flag.
With the above said you can now run node app.js, with app.js:
'use strict';
const MB = 1024 * 1024;
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getting both the syntax sugar and the benefits of strict mode.
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