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When should a class be Comparable and/or Comparator?
...other object." This is typically useful when there's a single natural default comparison.
Implementing Comparator means "I can compare two other objects." This is typically useful when there are multiple ways of comparing two instances of a type - e.g. you could compare people by age, name etc.
...
How to make a class JSON serializable
...rt JSONEncoder
>>> class MyEncoder(JSONEncoder):
def default(self, o):
return o.__dict__
>>> MyEncoder().encode(f)
'{"fname": "/foo/bar"}'
Then you pass this class into the json.dumps() method as cls kwarg:
json.dumps(cls=MyEncoder)
If you also want to...
What is the best method to merge two PHP objects?
...
The object resulting from this will be an instance of stdclass. While it does "work" in a sense on objects with methods, it effectively ruins the object in that case (by removing the methods).
– Brilliand
...
Seeking useful Eclipse Java code templates [closed]
...ve a cursor to a string, expand the selection to the entire string (Shift-Alt-Up), then Ctrl-Space twice.
Lock the selection
lock - surround the selected lines with a try finally lock. Assume the presence of a lock variable.
${lock}.acquire();
try {
${line_selection}
${cursor}
} finally {...
Create Git branch with current changes
... and working tree. Any changes to tracked files in the working tree since <commit> are discarded), I would rather go with:
$ git reset --soft HEAD~3 # (2)
This would make sure I'm not losing any private file (not added to the index).
The --soft option won't touch the index file nor the wor...
Programmatically scroll to a specific position in an Android ListView
...tView().setSelection(21);
For a smooth scroll:
getListView().smoothScrollToPosition(21);
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How does Bluebird's util.toFastProperties function make an object's properties “fast”?
...n into dictionary mode. Being in dictionary mode has a big performance penalty so generally it is desirable to put objects in fast mode.
This hack is intended to force the object into fast mode from dictionary mode.
Bluebird's Petka himself talks about it here.
These slides by Vyacheslav Egorov als...
Combine two columns of text in pandas dataframe
...+ df["quarter"]
Beware of NaNs when doing this!
If you need to join multiple string columns, you can use agg:
df['period'] = df[['Year', 'quarter', ...]].agg('-'.join, axis=1)
Where "-" is the separator.
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Subtract days from a date in JavaScript
... + d.toLocaleString());
d.setDate(d.getDate() - 5);
document.write('<br>5 days ago was: ' + d.toLocaleString());
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Can I make a user-specific gitignore file?
...ns unstaged changes you may need to run git update-index --skip-worktree [<file>...] (from hashrocket.com/blog/posts/…)
– Daniel Olivares
Jan 17 '18 at 1:55
add a comm...