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How do I shuffle an array in Swift?
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community wiki
20 revs, 3 users 81%Nate Cook
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Exotic architectures the standards committees care about
...s, it would be very difficult or impossible to write a standard conforming compiler for it.
7 Answers
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What is better, adjacency lists or adjacency matrices for graph problems in C++?
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It is slow to iterate over all edges
It is slow to add/delete a node; a complex operation O(n^2)
It is fast to add a new edge O(1)
Adjacency List
Memory usage depends on the number of edges (not number of nodes),
which might save a lot of memory if the adjacency matrix is sparse
Finding the...
How do I execute a string containing Python code in Python?
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A common case where someone wants to use 'exec' is something like if s=='foo': x.foo = 42 elif s=='bar': x.bar = 42 etc, which they may then write as exec ("x.%s = 42" % s). For this common case (where you only need to access a...
Namespace + functions versus static methods on a class
...g your functions in a namespace, you will authorize your users to increase/complete the class' interface.
Extension II
A side-effect of the previous point, it is impossible to declare static methods in multiple headers. Every method must be declared in the same class.
For namespaces, functions fr...
Why use strict and warnings?
... typos in variable names. Even experienced programmers make such errors. A common case is forgetting to rename an instance of a variable when cleaning up or refactoring code.
Using use strict; use warnings; catches many errors sooner than they would be caught otherwise, which makes it easier to fin...
Placeholder in UITextView
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community wiki
14 revs, 9 users 37%Jason George
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Best way to replace multiple characters in a string?
... text = text.replace(ch,"\\"+ch)
import re
def c(text):
rx = re.compile('([&#])')
text = rx.sub(r'\\\1', text)
RX = re.compile('([&#])')
def d(text):
text = RX.sub(r'\\\1', text)
def mk_esc(esc_chars):
return lambda s: ''.join(['\\' + c if c in esc_chars else c for...
Can “git pull --all” update all my local branches?
...ibed steps into a script/alias if you like, though I'd suggest joining the commands with && so that should one of them fail, it won't try to plow on.
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Are there any downsides to passing structs by value in C, rather than passing a pointer?
...ny will do it, but it's not anything that the C standard calls for. A sane compiler will optimize it all out.
– Unslander Monica
Feb 1 '15 at 18:05
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