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Filter Java Stream to 1 and only 1 element
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Create a custom Collector
public static <T> Collector<T, ?, T> toSingleton() {
return Collectors.collectingAndThen(
Collectors.toList(),
list -> {
if (list.size() != 1) {
thr...
What do (lambda) function closures capture?
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Your second question has been answered, but as for your first:
what does the closure capture exactly?
Scoping in Python is dynamic and lexical. A closure will always remember the name and scope of the variable, not the object it's pointing to. ...
Subqueries vs joins
...tion we inherited from another company to use an inner join instead of a subquery like:
14 Answers
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Can you list the keyword arguments a function receives?
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A little nicer than inspecting the code object directly and working out the variables is to use the inspect module.
>>> import inspect
>>> def func(a,b,c=42, *args, **kwargs): pass
>>> inspect.getargspec(func)
(['a', 'b', 'c'], 'args', 'k...
How do I count the number of occurrences of a char in a String?
...idiomatic one-liner' for this is:
int count = StringUtils.countMatches("a.b.c.d", ".");
Why write it yourself when it's already in commons lang?
Spring Framework's oneliner for this is:
int occurance = StringUtils.countOccurrencesOf("a.b.c.d", ".");
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How to use mysql JOIN without ON condition?
Is it possible to write join query without ON statement? and how do these joins differ LEFT JOIN, RIGHT JOIN works.
2 A...
Difference between git pull --rebase and git pull --ff-only
Let's say origin/master has commit A--B--C and my local/master has commit A--B--D .
1 Answer
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Is there a built-in method to compare collections?
...ctions in my Equals method. I have a Dictionary and an IList. Is there a built-in method to do this?
15 Answers
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Regex replace uppercase with lowercase letters
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Alex K.Alex K.
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How would I skip optional arguments in a function call?
...answered Jun 30 '09 at 23:35
zombatzombat
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