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Unpacking, extended unpacking and nested extended unpacking
...the length of this post, but I decided to opt for completeness.
Once you know a few basic rules, it's not hard to generalize them. I'll do my best to explain with a few examples. Since you're talking about evaluating these "by hand," I'll suggest some simple substitution rules. Basically, you might...
Insert a line break in mailto body
...codeURIComponent().
For example, this message:
hello\rthis answer is now well formated\rand it contains good knowleadge\rthat is why I am up voting
URI Encoded, results in:
hello%0Dthis%20answer%20is%20now%20well%20formated%0Dand%20it%20contains%20good%20knowleadge%0Dthat%20is%20why%20I%20a...
How to select records from last 24 hours using SQL?
...elect the last 24 hours from a datetime field, substitute 'curate()' with 'now()'. This also includes the time.
– Haentz
Apr 30 '11 at 6:11
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How can I get the DateTime for the start of the week?
How do I find the start of the week (both Sunday and Monday) knowing just the current time in C#?
32 Answers
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What is the difference between typeof and instanceof and when should one be used vs. the other?
... instanceof Object returns false, and doesn't throw an exception. I don't know how recent that change is, but it makes instanceof more appealing.
– Cypress Frankenfeld
Jun 26 '13 at 16:01
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How to get the last day of the month?
...s **kwargs I wouldn't rely on that and do a series of separate operations: now + relative(months=+1) + relative(day=1) + relative(days=-1) which is unambiguous.
– Alfe
Sep 24 '19 at 10:07
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Predicate in Java
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static boolean isEven(int num) {
return (num % 2) == 0; // simple
}
Now, given a List<Integer>, you can process only the even numbers like this:
List<Integer> numbers = Arrays.asList(1,2,3,4,5,6,7,8,9,10);
for (int number : numbers) {
if (isEven(number)) {
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MongoDB: update every document on one field
...n, for your example, the <update> is:
{ $set: { lastLookedAt: Date.now() / 1000 } }
However, depending on your version of MongoDB, the query will look different. Regardless of version, the key is that the empty condition {} will match any document. In the Mongo shell, or with any MongoDB ...
Hidden features of Perl?
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There are many non-obvious features in Perl.
For example, did you know that there can be a space after a sigil?
$ perl -wle 'my $x = 3; print $ x'
3
Or that you can give subs numeric names if you use symbolic references?
$ perl -lwe '*4 = sub { print "yes" }; 4->()'
yes
There's a...
How do I update zsh to the latest version?
... worth fixing whatever problems you're having with it. That said, I don't know that I want to use it to replace Apple's zsh...
– Marnen Laibow-Koser
Dec 3 '13 at 16:00
3
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