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Check if a JavaScript string is a URL
Is there a way in JavaScript to check if a string is a URL?
32 Answers
32
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What does the star operator mean, in a function call?
... to accept any number of positional and/or named arguments that aren't specifically named in the declaration.
Example:
def sum(*values):
s = 0
for v in values:
s = s + v
return s
s = sum(1, 2, 3, 4, 5)
or with **:
def get_a(**values):
return values['a']
s = get_a(a=1, ...
Round a double to 2 decimal places [duplicate]
If the value is 200.3456 , it should be formatted to 200.34 .
If it is 200 , then it should be 200.00 .
13 Answers
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Get the cartesian product of a series of lists?
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Just wanted to add the '*' character is required if you use the variable somelists as provided by the OP.
– brian buck
Jan 13 '11 at 22:51
3
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Using isKindOfClass with Swift
I'm trying to pick up a bit of Swift lang and I'm wondering how to convert the following Objective-C into Swift:
5 Answers
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One-liner to check whether an iterator yields at least one element?
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any won't go beyond the first element if it's True. In case the iterator yields something false-ish you can write any(True for _ in iterator).
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improve th...
All combinations of a list of lists
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@Reman It's not entirely clear what you want to get but if it is, for example, also the reverse of each tuple you can use a a wrapper function that takes a as input, iterates over itertools.product(*a) and yields both the tuple produced by itertools and a reverse version (e.g. cre...
Counting the number of True Booleans in a Python List
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I can't count False values if there is 0 value also
– Kostanos
Aug 20 '15 at 18:55
10
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Remove array element based on object property
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filter() creates a new array, which is fine if you're able to reassign the variable and know that there aren't other areas of code that have references to it. This won't work if you specifically need to modify the original array object.
– Brian G...
Stripping everything but alphanumeric chars from a string in Python
...it -s \
"import string" \
"''.join(ch for ch in string.printable if ch.isalnum())"
10000 loops, best of 3: 57.6 usec per loop
$ python -m timeit -s \
"import string" \
"filter(str.isalnum, string.printable)"
10000 loops, best of 3: 37.9 usec per loop
$ python -m...