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How to turn NaN from parseInt into 0 for an empty string?
...r num = parseInt(s) || 0;
When not used with boolean values, the logical OR (||) operator returns the first expression (parseInt(s)) if it can be evaluated to true, otherwise it returns the second expression (0). The return value of parseInt('') is NaN. NaN evaluates to false, so num ends up being...
How to check if a variable exists in a FreeMarker template?
I have a Freemarker template which contains a bunch of placeholders for which values are supplied when the template is processed. I want to conditionally include part of the template if the userName variable is supplied, something like:
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Should I use the Reply-To header when sending emails as a service to others?
...ave an application that acts as a middleman, allowing Company A to send reports to their customers.
3 Answers
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limiting java ssl debug logging
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The format for using the additional ssl flags is ssl:[flag] for example:
-Djavax.net.debug=ssl:record or -Djavax.net.debug=ssl:handshake.
share
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jQuery multiple events to trigger the same function
... keypress , blur , and change events call the same function in one line or do I have to do them separately?
11 Answers
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How can I update npm on Windows?
... the new best way to upgrade npm on Windows.
Run PowerShell as Administrator
Set-ExecutionPolicy Unrestricted -Scope CurrentUser -Force
npm install -g npm-windows-upgrade
npm-windows-upgrade
Note: Do not run npm i -g npm. Instead use npm-windows-upgrade to update npm going forward. Also if you r...
How can I use vim to convert my file to utf8?
...u are editing a file encoded as latin1, you will find that 'fileencoding' for that buffer is set to latin1. So you will need to manually set the fileencoding before saving the file.
:set fileencoding=utf8
:w myfilename
Also note that UTF8 files often begin with a Byte Order Mark (BOM) which indi...
Is file append atomic in UNIX?
In general, what can we take for granted when we append to a file in UNIX from multiple processes? Is it possible to lose data (one process overwriting the other's changes)? Is it possible for data to get mangled? (For example, each process is appending one line per append to a log file, is it po...
ElasticSearch - Return Unique Values
How would I get the values of all the languages from the records and make them unique.
5 Answers
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Difference between static class and singleton pattern?
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What makes you say that either a singleton or a static method isn't thread-safe? Usually both should be implemented to be thread-safe.
The big difference between a singleton and a bunch of static methods is that singletons can implement interfaces (or derive from use...