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Best approach to converting Boolean object to string in java
... not null you can use third option which is
String str3 = b.toString();
and its code looks like
public String toString() {
return value ? "true" : "false";
}
If you want to be null-safe use String.valueOf(b) which code looks like
public static String valueOf(Object obj) {
return (ob...
foldl versus foldr behavior with infinite lists
...r folding a list of n values [x1, x2, x3, x4 ... xn ] with some function f and seed z.
foldl is:
Left associative: f ( ... (f (f (f (f z x1) x2) x3) x4) ...) xn
Tail recursive: It iterates through the list, producing the value afterwards
Lazy: Nothing is evaluated until the result is needed
Backw...
Matplotlib: draw grid lines behind other graph elements
...
According to this - http://matplotlib.1069221.n5.nabble.com/axis-elements-and-zorder-td5346.html - you can use Axis.set_axisbelow(True)
(I am currently installing matplotlib for the first time, so have no idea if that's correct - I just found it by googling "matplotlib z order grid" - "z order" is...
Replace input type=file by an image
Like a lot of people, I'd like to customize the ugly input type=file , and I know that it can't be done without some hacks and/or javascript . But, the thing is that in my case the upload file buttons are just for uploading images ( jpeg|jpg|png|gif ), so I was wondering if I could use a " clickab...
Reading/parsing Excel (xls) files with Python
...o, be warned that doing this is a real PITA. The number of caveats is huge and the documentation is lacking and annoying. I ran into many weird bugs and gotchas, some of which took many hours to figure out.
UPDATE: For newer .xlsx files, the recommended library for reading and writing appears to be...
How to format current time using a yyyyMMddHHmmss format?
...
I did not know the sequential mnemonic, handy, but come on why is it not the 1st February...
– silasdavis
Aug 10 '18 at 13:08
4
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How to check if there's nothing to be committed in the current branch?
... goal is to get an unambiguous status that can be evaluated in a shell command.
9 Answers
...
Converting ISO 8601-compliant String to java.util.Date
...Unfortunately, the time zone formats available to SimpleDateFormat (Java 6 and earlier) are not ISO 8601 compliant. SimpleDateFormat understands time zone strings like "GMT+01:00" or "+0100", the latter according to RFC # 822.
Even if Java 7 added support for time zone descriptors according to ISO ...
How to check if element exists using a lambda expression?
Specifically, I have TabPane, and I would like to know if there is element with specific ID in it.
3 Answers
...
What is the fastest factorial function in JavaScript? [closed]
...torial function that uses big numbers to get exact result with memoization and cache as comparison
var f = [new BigNumber("1"), new BigNumber("1")];
var i = 2;
function factorial(n)
{
if (typeof f[n] != 'undefined')
return f[n];
var result = f[i-1];
for (; i <= n; i++)
f[i] = resu...