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How can I output leading zeros in Ruby?
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Use String#next as the counter.
>> n = "000"
>> 3.times { puts "file_#{n.next!}" }
file_001
file_002
file_003
next is relatively 'clever', meaning you can even go for
>> n = "file_000"
>> 3.times { puts n.next! }
file_001
file_002
file_003
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What exactly are iterator, iterable, and iteration?
...s a general term for taking each item of something, one after another. Any time you use a loop, explicit or implicit, to go over a group of items, that is iteration.
In Python, iterable and iterator have specific meanings.
An iterable is an object that has an __iter__ method which returns an itera...
Replace values in list using Python [duplicate]
...odify the original list in-place if you want, but it doesn't actually save time:
items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
for index, item in enumerate(items):
if not (item % 2):
items[index] = None
Here are (Python 3.6.3) timings demonstrating the non-timesave:
In [1]: %%timeit
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Get ffmpeg information in friendly way
Every time I try to get some information about my video files with ffmpeg, it pukes a lot of useless information mixed with good things.
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What are Runtime.getRuntime().totalMemory() and freeMemory()?
I've been wondering what the exact meaning of Runtime.getRuntime().totalMemory() , Runtime.getRuntime().freeMemory() , and Runtime.getRuntime().maxMemory() is.
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Convert LocalDate to LocalDateTime or java.sql.Timestamp
I am using JodaTime 1.6.2.
7 Answers
7
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Why does a RegExp with global flag give wrong results?
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You are using a single RegExp object and executing it multiple times. On each successive execution it continues on from the last match index.
You need to "reset" the regex to start from the beginning before each execution:
result.push(re.test('Foo Bar'));
re.lastIndex = 0;
result.push(...
Can I implement an autonomous `self` member type in C++?
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I used that solution a couple of times, and it has one BAD thing: when later deriving from Foo, you have to either: (1) propagate the T upwards to the leaf-descendant, or (2) remember to inherit from SelfT many times, or (3) accept that all children thing to...
How do iOS Push Notifications work?
...he notification from notification center and launches the app. During this time you can perform the processes that you wish to do.
– Karan Alangat
May 16 '17 at 9:17
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Where does the “flatmap that s***” idiomatic expression in Scala come from?
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I personally use the list monad sometimes to deal with combinations.
– Dan Burton
Dec 20 '11 at 1:56
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