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kill -3 to get java thread dump
I am using kill -3 command to see the JVM's thread dump in unix. But where can I find the output of this kill command? I am lost!!
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Most efficient way to prepend a value to an array
...-O but certainly using the unshift method is more concise:
var a = [1, 2, 3, 4];
a.unshift(0);
a; // => [0, 1, 2, 3, 4]
[Edit]
This jsPerf benchmark shows that unshift is decently faster in at least a couple of browsers, regardless of possibly different big-O performance if you are ok with mo...
Swift make method parameter mutable?
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As stated in other answers, as of Swift 3 placing var before a variable has been deprecated. Though not stated in other answers is the ability to declare an inout parameter. Think: passing in a pointer.
func reduceToZero(_ x: inout Int) {
while (x != 0) {
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How to make the 'cut' command treat same sequental delimiters as one?
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edited Apr 23 '18 at 23:03
Austin Adams
6,45533 gold badges2020 silver badges2727 bronze badges
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Elegant ways to support equivalence (“equality”) in Python classes
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342
Consider this simple problem:
class Number:
def __init__(self, number):
self.num...
How do I run multiple background commands in bash in a single line?
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335
Exactly how do you want them to run? If you want them to be started in the background and run ...
What is the difference between HashSet and List?
...and hashSet2
//returns a list of distinct items in both sets
HashSet set3 = set1.Union( set2 );
flies in comparison with an equivalent operation using LINQ. It's also neater to write!
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How do I get whole and fractional parts from double in JSP/Java?
...I get whole and fractional parts from double in JSP/Java ? If the value is 3.25 then I want to get fractional =.25 , whole = 3
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How to copy a dictionary and only edit the copy
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937
Python never implicitly copies objects. When you set dict2 = dict1, you are making them refer t...
INSERT IF NOT EXISTS ELSE UPDATE?
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330
Have a look at http://sqlite.org/lang_conflict.html.
You want something like:
insert or repl...