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Rounding BigDecimal to *always* have two decimal places
...s for RoundingMode.HALF_UP. As per documentation it is the rounding method commonly taught in schools - what I needed.
– silver
Jul 16 '17 at 5:40
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How to validate an email address using a regular expression?
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The fully RFC 822 compliant regex is inefficient and obscure because of its length. Fortunately, RFC 822 was superseded twice and the current specification for email addresses is RFC 5322. RFC 5322 leads to a regex that can be understood if ...
How to iterate over the keys and values in an object in CoffeeScript?
...nsider the variant for own k,v of ages as mentioned by Aaron Dufour in the comments. This adds a check to exclude properties inherited from the prototype, which is probably not an issue in this example but may be if you are building on top of other stuff.
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Running a cron job at 2:30 AM everyday
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crontab -e
add:
30 2 * * * /your/command
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How to use JavaScript source maps (.map files)?
...cryptic at best.
Same for CSS files. Once you take a SASS or LESS file and compile it to CSS, it looks nothing like its original form. If you enable sourcemaps, then you can see the original state of the file, instead of the modified state.
So, to answer you questions in order:
What is it for? To d...
How to save as a new file and keep working on the original one in Vim?
Whenever I use the :sav command, it saves the file with a new name and opens the new file open in Vim.
4 Answers
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Git diff between current branch and master but not including unmerged master commits
...n man gitrevisions.
Quoting man git-diff:
git diff [--options] <commit> <commit> [--] [<path>…]
This is to view the changes between two arbitrary <commit>.
git diff [--options] <commit>..<commit> [--] [<path>…]
This is synonymous to t...
What makes JNI calls slow?
...tive methods will not be inlined by the JVM. Nor will they be just-in-time compiled for this specific machine -- they're already compiled.
A Java array may be copied for access in native code, and later copied back. The cost can be linear in the size of the array. I measured JNI copying of a 100,000...
How do I find which transaction is causing a “Waiting for table metadata lock” state?
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Check out the comment below stackoverflow.com/a/36175882/362574
– Joddy
Mar 21 '18 at 7:15
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Decoding JSON using json.Unmarshal vs json.NewDecoder.Decode
...e).
So a better rule of thumb is this:
Use json.Decoder if your data is coming from an io.Reader stream, or you need to decode multiple values from a stream of data.
Use json.Unmarshal if you already have the JSON data in memory.
For the case of reading from an HTTP request, I'd pick json.Decod...