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parseInt vs unary plus, when to use which?
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#Please see this answer for a more complete set of cases
Well, here are a few differences I know of:
An empty string "" evaluates to a 0, while parseInt evaluates it to NaN. IMO, a blank string should be a NaN.
+'' === 0; //true
isNaN(parseInt('',1...
For files in directory, only echo filename (no path)
...o for f in $(...) ... fails if any filename contains whitespace unless you set IFS, may fail if any filename contains a glob char unless you set -f/-o noglob, and depending on system or shell echo may fail if any filename is hyphen+letter or contains backslash. OTOH just ls -1 /path/to/dir all by it...
How can I parse a YAML file in Python
...-readable data; VERY commonly used (read & write)
YAML: YAML is a superset of JSON, but easier to read (read & write, comparison of JSON and YAML)
pickle: A Python serialization format (read & write)
MessagePack (Python package): More compact representation (read & write)
HDF5 (Pytho...
Make a Bash alias that takes a parameter?
...f you closed and reopened, but keeping that session's environment variable settings too. Also, executing bash without the exec can be useful when you want to handle thinks like a stack.
– Macneil Shonle
Jul 9 '14 at 16:39
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How do I check if a file exists in Java?
The only similar question on SO deals with writing the file and was thus answered using FileWriter which is obviously not applicable here.
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Best way to make Django's login_required the default
...dified from a snippet found elsewhere:
import re
from django.conf import settings
from django.contrib.auth.decorators import login_required
class RequireLoginMiddleware(object):
"""
Middleware component that wraps the login_required decorator around
matching URL patterns. To use, add...
PHP date yesterday [duplicate]
I was wondering if there was a simple way of getting yesterday's date through this format:
3 Answers
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'is' versus try cast with null check
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Because there's only one cast. Compare this:
if (myObj.myProp is MyType) // cast #1
{
var myObjRef = (MyType)myObj.myProp; // needs to be cast a second time
// before using it as a MyType
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}
to this:
var myObjRef = m...
How do I mock an open used in a with statement (using the Mock framework in Python)?
... currently at voidspace.org.uk/python/mock/magicmock.html which explicitly sets __enter__ and __exit__ to mock objects as well — is the latter approach out of date, or still useful?
– Brandon Rhodes
May 24 '11 at 16:18
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ls command: how can I get a recursive full-path listing, one line per file?
How can I get ls to spit out a flat list of recursive one-per-line paths?
24 Answers
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