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What reason is there to use null instead of undefined in JavaScript?
I've been writing JavaScript for quite a long time now, and I have never had a reason to use null . It seems that undefined is always preferable and serves the same purpose programmatically. What are some practical reasons to use null instead of undefined ?
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Replace all whitespace characters
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You want \s
Matches a single white space
character, including space, tab, form
feed, line feed.
Equivalent to
[ \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]
in Firefox and [ \f\n\r\t\v] in IE.
str = str.repl...
JavaScript closures vs. anonymous functions
A friend of mine and I are currently discussing what is a closure in JS and what isn't. We just want to make sure we really understand it correctly.
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Iterating through a range of dates in Python
I have the following code to do this, but how can I do it better? Right now I think it's better than nested loops, but it starts to get Perl-one-linerish when you have a generator in a list comprehension.
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Why is there no tuple comprehension in Python?
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You can use a generator expression:
tuple(i for i in (1, 2, 3))
but parentheses were already taken for … generator expressions.
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Re-ordering columns in pandas dataframe based on column name [duplicate]
... want column Q10.3 to appear after Q9.1), you'll need to sort differently, but that has nothing to do with pandas.
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Can I change multiplier property for NSLayoutConstraint?
I created two views in one superview, and then added constraints between views:
13 Answers
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Loop through all nested dictionary values?
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As said by Niklas, you need recursion, i.e. you want to define a function to print your dict, and if the value is a dict, you want to call your print function using this new dict.
Something like :
def myprint(d):
for k, v in d....
How to globally replace a forward slash in a JavaScript string?
How to globally replace a forward slash in a JavaScript string?
10 Answers
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Difference between object and class in Scala
...some Scala tutorials on the Internet and have noticed in some examples an object is declared at the start of the example.
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