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What is the meaning of “$” sign in JavaScript
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Prototype, jQuery, and most javascript libraries use the $ as the primary base object (or function). Most of them also have a way to relinquish the $ so that it can be used with another library that uses it. In that case you use jQuery instead of $. In fact, $ is just a shortcut for jQuery.
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How to convert string representation of list to a list?
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Inspired from some of the answers above that work with base python packages I compared the performance of a few (using Python 3.7.3):
Method 1: ast
import ast
list(map(str.strip, ast.literal_eval(u'[ "A","B","C" , " D"]')))
# ['A', 'B', 'C', 'D']
import timeit
timeit.timeit(st...
Java: Clear the console
...nt variable. All this code does is call the Windows or Unix system command based on the default system configuration to clear the command prompt or terminal window respectively. It should be exactly the same as opening a terminal window and typing "cls" followed by the Enter key.
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How do you rename a table in SQLite 3.0?
...ut I assume that the following is also correct:
ALTER TABLE existing_database.existing_table
RENAME TO new_database.new_table;
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Python - 'ascii' codec can't decode byte
...g it with a u:
Python 2.7.2 (default, Jan 14 2012, 23:14:09)
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> "你好".encode("utf8")
Traceback (most recent call last):
File "<std...
How to generate all permutations of a list?
...:r])
break
else:
return
And another, based on itertools.product:
def permutations(iterable, r=None):
pool = tuple(iterable)
n = len(pool)
r = n if r is None else r
for indices in product(range(n), repeat=r):
if len(set(indices)) == r:
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What does character set and collation mean exactly?
...ead of one.
Choosing the right collation can help performance if your database uses the collation to create an index, and later uses that index to provide sorted results. However, since collation rules are often locale-specific, that index will be worthless if you need to sort results according to ...
How do I parse a string to a float or int?
...e string isn't a valid integer: ValueError: invalid literal for int() with base 10: '545.222', but converting from a float to an int is a supported conversion.
– David Parks
May 7 '18 at 17:46
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How to explain dependency injection to a 5-year-old? [closed]
...ass, it's natural for it to make use of other objects. You may have a database connection, for example, or some other service that you use. These other objects (or services) are dependencies. The simplest way to write the code is simply to create and use those other objects. But this means your ...
How can I open a URL in Android's web browser from my application?
...android.net.Uri instance to the 2nd parameter, and a new Intent is created based on the given data url.
And then, simply call startActivity(Intent intent) to start a new Activity, which is bundled with the Intent with the given URL.
Do I need the if check statement?
Yes. The docs says:
If th...