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Remove blank attributes from an Object in Javascript
...ete obj[key]);
};
jsbin
4) This function uses recursion to delete items from nested objects as well:
const removeEmpty = obj => {
Object.keys(obj).forEach(key => {
if (obj[key] && typeof obj[key] === "object") removeEmpty(obj[key]); // recurse
else if (obj[key] == null) d...
Do AJAX requests retain PHP Session info?
...I had a user logged onto my site, having his id stored in $_SESSION , and from his browser he clicked a 'Save' button which would make an AJAX request to the server. Will his $_SESSION and cookies be retained in this request, and can I safely rely on the id being present in the $_SESSION ?
...
How do I delete unpushed git commits?
...
From my experience, this does not undo the commit from the original branch, thus necessitating the git reset --hard HEAD~1 afterwards. I think using reset --soft then switching branches and committing again would have saved ...
Defining custom attrs
...
If you are using custom attrs from a library project: see this question: stackoverflow.com/questions/5819369/… - It seems to work if you use xmlns:my="http://schemas.android.com/apk/lib/my.namespace" - no copying attrs.xml. Note the namespace URI path ...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...behind this answer can be found here.
Suppose we have some data sampled from two different groups, red and blue:
Here, we can see which data point belongs to the red or blue group. This makes it easy to find the parameters that characterise each group. For example, the mean of the red group is...
How do I calculate percentiles with python/numpy?
...ues. Note N MUST BE already sorted.
@parameter percent - a float value from 0.0 to 1.0.
@parameter key - optional key function to compute value from each element of N.
@return - the percentile of the values
"""
if not N:
return None
k = (len(N)-1) * percent
f = m...
How do you rename a MongoDB database?
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How is this different from the solution provided by the OP?
– Salvador Dali
Apr 3 '14 at 3:26
6
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What's the difference between a single precision and double precision floating point operation?
..., cache, and bandwidth, thereby reducing the overall system performance.
From Webopedia:
The term double precision is something of a misnomer because the precision is not really double.
The word double derives from the fact that a double-precision number uses twice as many bits as a regular ...
How to get the current working directory in Java?
...getProperty("user.dir"));
}
}
This will print a complete absolute path from where your application was initialized.
From the documentation:
java.io package resolve relative pathnames using current user directory. The current directory is represented as system property, that is, user.dir and ...
Token Authentication vs. Cookies
...kie in every response back to the client. This means the next request made from the client will include this cookie and will thus be recognized by the server. This way the server can maintain a session with the stateless client, knowing mostly everything about the app's state, but stored in the serv...