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Event on a disabled input
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Disabled elements don't fire mouse events. Most browsers will propagate an event originating from the disabled element up the DOM tree, so event handlers could be placed on container elements. However, Firefox doesn't exhibit this behaviour,...
Java: How to convert List to Map
...y to convert List to Map in Java and if there any specific benefits of doing so.
18 Answers
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Understanding promises in Node.js
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Promises in node.js promised to do some work and then had separate callbacks that would be executed for success and failure as well as handling timeouts. Another way to think of promises in node.js was that they were emitters that could emit only two events...
Check if an array is empty or exists
...preferable, for readability in the future, to "say what you mean". I would do .. && image_array.length > 0).
– ToolmakerSteve
Oct 12 '19 at 12:17
add a comment
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Why does ++[[]][+[]]+[+[]] return the string “10”?
...] === 0. + converts something into a number, and in this case it will come down to +"" or 0 (see specification details below).
Therefore, we can simplify it (++ has precendence over +):
++[[]][0]
+
[0]
Because [[]][0] means: get the first element from [[]], it is true that:
[[]][0] returns the ...
How to check if an object is nullable?
How do I check if a given object is nullable in other words how to implement the following method...
14 Answers
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Get nth character of a string in Swift programming language
....upperBound)] }
}
To convert the Substring into a String, you can simply
do String(string[0..2]), but you should only do that if
you plan to keep the substring around. Otherwise, it's more
efficient to keep it a Substring.
It would be great if someone could figure out a good way to merge
these tw...
What is the Python equivalent of Matlab's tic and toc functions?
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Apart from timeit which ThiefMaster mentioned, a simple way to do it is just (after importing time):
t = time.time()
# do stuff
elapsed = time.time() - t
I have a helper class I like to use:
class Timer(object):
def __init__(self, name=None):
self.name = name
def __e...
git: undo all working dir changes including new files
...ing directory including new untracked files. I know that git checkout -f does that, but it doesn't delete new untracked files created since last commit.
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How to start new activity on button click
In an Android application, how do you start a new activity (GUI) when a button in another activity is clicked, and how do you pass data between these two activities?
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