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Is JavaScript guaranteed to be single-threaded?
...ible to scripts(*), so that when your inline script, event listener or timeout is entered, you remain completely in control until you return from the end of your block or function.
(*: ignoring the question of whether browsers really implement their JS engines using one OS-thread, or whether other ...
Can I find out the return value before returning while debugging in Visual Studio?
...ng to have: not only seeing the return value of the method before stepping out of it, but also seeing the return value of methods I just stepped over. I implemented it as part of a commercial extension to Visual Studio called "OzCode".
With it, you can view method return values right on the code ed...
Pandas - How to flatten a hierarchical index in columns
...cond index.
In [11]: [' '.join(col).strip() for col in df.columns.values]
Out[11]:
['USAF',
'WBAN',
'day',
'month',
's_CD sum',
's_CL sum',
's_CNT sum',
's_PC sum',
'tempf amax',
'tempf amin',
'year']
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How to round a number to n decimal places in Java
...ue with the half-even round, then use the format pattern for your required output.
Example:
DecimalFormat df = new DecimalFormat("#.####");
df.setRoundingMode(RoundingMode.CEILING);
for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) {
Double d = n.doubleValue();
Sy...
Can I use break to exit multiple nested 'for' loops?
... each loop check the flag value. If it is set to true, then you can break out of that iteration.
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how to break the _.each function in underscore.js
...);
return n !== 3;
});
This will alert 1 through 3, and then "break" out of the loop.
You're using underscore.js, so you'll be pleased to learn that it does provide an every method—they call it every, but as that link mentions, they also provide an alias called all.
...
What exactly does an #if 0 … #endif block do?
...
It's identical to commenting out the block, except with one important difference: Nesting is not a problem. Consider this code:
foo();
bar(x, y); /* x must not be NULL */
baz();
If I want to comment it out, I might try:
/*
foo();
bar(x, y); /* x must...
pull out p-values and r-squared from a linear regression
How do you pull out the p-value (for the significance of the coefficient of the single explanatory variable being non-zero) and R-squared value from a simple linear regression model? For example...
...
Recommended method for escaping HTML in Java
... recommended way to escape < , > , " and & characters when outputting HTML in plain Java code? (Other than manually doing the following, that is).
...
How to know what the 'errno' means?
...ou're formatting the error message for something other than standard error output.
For example:
#include <errno.h>
#include <string.h>
/* ... */
if(read(fd, buf, 1)==-1) {
printf("Oh dear, something went wrong with read()! %s\n", strerror(errno));
}
Linux also supports the expl...