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Determine Whether Integer Is Between Two Other Integers?
...e(1,4) is False. So better use the 1 >= r <= 4 as it avoids possible errors by newcomers
– tripplet
Jun 26 '14 at 8:01
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Can't use method return value in write context
..., return value exists and contains null). Therefore:
if (!empty($r->getError()))
is logically equivalent to:
if ($r->getError())
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foll...
What is the Scala annotation to ensure a tail recursive function is optimized?
...eption("bang!")
| else bang(x-1)
| }
| }
<console>:9: error: could not optimize @tailrec annotated method: it contains a recursive call not in tail position
@tailrec def boom(x: Int): Int = {
^
<console>:13: error: could not optimize @tailrec ann...
MYSQL Truncated incorrect DOUBLE value
...ed with (what appeared to be) a numeric value in the where clause threw an error. Changing modes, it threw a warning instead, but still did not apply the update. Upon closer inspection, the column used in the where clause, despite only having what appeared to be integer values, was actually a varcha...
Rails raw SQL example
...ails? Because When I deploy this code in heroku,there is a request timeout error.I think this will be faster if I use raw sql.
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AngularJS ng-class if-else expression
With AngularJS I'm using ng-class the following way:
9 Answers
9
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Django TemplateDoesNotExist?
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I had an embarrassing problem...
I got this error because I was rushing and forgot to put the app in INSTALLED_APPS. You would think Django would raise a more descriptive error.
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An error occurred while installing pg (0.17.1), and Bundler cannot continue
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Some kind of error resported here Installing PG gem on OS X - failure to build native extension
To install dependencies on Ubuntu try this:
sudo apt-get install libpq-dev
and this
gem install pg
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Creating default object from empty value in PHP?
I see this error only after upgrading my PHP environment to PHP 5.4 and beyond. The error points to this line of code:
16 A...
How to get a microtime in Node.js?
...* 1000000 + hrTime[1] / 1000)
(Thanks to itaifrenkel for pointing out an error in the conversion above.)
In modern browsers, time with microsecond precision is available as performance.now. See https://developer.mozilla.org/en-US/docs/Web/API/Performance/now for documentation.
I've made an imple...