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Retain cycle on `self` with blocks
...nswered Dec 4 '10 at 8:14
Lily BallardLily Ballard
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undefined reference to `__android_log_print'
...sary. Please accept the other answer instead.
– Jeff Allen
Jun 21 '13 at 11:23
5
If using the new...
ASP.NET MVC View Engine Comparison
...ntent can be tricky. Despite this, razor's data model is essentially just string-concatenation, so syntax and nesting errors are neither statically nor dynamically detected, though VS.NET design-time help mitigates this somewhat. Maintainability and refactorability can suffer due to this.
No docum...
Python list subtraction operation
... [1,2] you will get empty list. [1,1,2,2] - [2] gives [1,1] So it is not really list substraction, it is more like "List from List X without elements from set Y".
– Alfred Zien
Feb 6 '16 at 10:25
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In what cases could `git pull` be harmful?
...never seen recommended anywhere and it is the cause all of the unnecessary extra work described below the heading, not git pull.
– Ben Regenspan
Mar 12 '14 at 17:30
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How to var_dump variables in twig templates?
... layer pattern where you only present what you have been given is fine and all, but how do you know what is available? Is there a "list all defined variables" functionality in TWIG? Is there a way to dump a variable?
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How do you delete an ActiveRecord object?
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It's destroy and destroy_all methods, like
user.destroy
User.find(15).destroy
User.destroy(15)
User.where(age: 20).destroy_all
User.destroy_all(age: 20)
Alternatively you can use delete and delete_all which won't enforce :before_destroy and :after...
Get a random boolean in python?
... but I found that random.getrandbits(1) to be quite a lot faster. If you really want a boolean instead of a long then
bool(random.getrandbits(1))
is still about twice as fast as random.choice([True, False])
Both solutions need to import random
If utmost speed isn't to priority then random.choic...
Move entire line up and down in Vim
... difficulties with just using Vim combinations. These are line missing and extra line jumping.
So here is the scripting solution which can be placed either inside .vimrc or ~/.vim/plugin/swap_lines.vim
function! s:swap_lines(n1, n2)
let line1 = getline(a:n1)
let line2 = getline(a:n2)
c...
How to get the ThreadPoolExecutor to increase threads to max before queueing?
...rQueue is unbounded so you don't get a capacity-bounded task queue without extra work.
– Yeroc
Jan 10 '17 at 17:36
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