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When is JavaScript synchronous?
... It won't interrupt any other code that's currently running.
JavaScript timers operate with this same kind of callback.
Describing JavaScript as asynchronous is perhaps misleading. It's more accurate to say that JavaScript is synchronous and single-threaded with various callback mechanisms.
jQuer...
Execute method on startup in Spring
Is there any Spring 3 feature to execute some methods when the application starts for the first time? I know that I can do the trick of setting a method with @Scheduled annotation and it executes just after the startup, but then it will execute periodically.
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JSON.stringify without quotes on properties?
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This simple regular expression solution works to unquote JSON property names in most cases:
const object = { name: 'John Smith' };
const json = JSON.stringify(object); // {"name":"John Smith"}
console.log(json);
const unquoted = json.replace(/"([^"]+)":/g, '$1:');
console.log(unquoted); ...
iReport not starting using JRE 8
...ou unpack twice the jre-7u67-windows-x64.tar.gz you end up with a folder named jre1.7.0_67. Put that folder in the iReport-5.6.0 directory:
and then go into the etc folder and edit the file ireport.conf and add the following line into it:
For Windows
jdkhome=".\jre1.7.0_67"
For Linux
jdkhome="....
How do I print a double value with full precision using cout?
...m precision of a float or double.
#include <limits>
typedef std::numeric_limits< double > dbl;
double d = 3.14159265358979;
cout.precision(dbl::max_digits10);
cout << "Pi: " << d << endl;
sh...
Nodejs cannot find installed module on Windows
I am learning nodejs at the moment on Windows. Several modules are installed globally with npm.cmd, and nodejs failed to find the installed modules. Take jade for example,
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Is it possible to use JavaScript to change the meta-tags of the page?
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Yes, you can do that.
There are some interesting use cases: Some browsers and plugins parse meta elements and change their behavior for different values.
Examples
Skype: Switch off phone number parser
<meta name="SKYPE_TOOLBAR" content="SKYPE_TOOLBAR_PA...
Drop all tables whose names begin with a certain string
How can I drop all tables whose names begin with a given string?
14 Answers
14
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How do I find out what keystore my JVM is using?
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Your keystore will be in your JAVA_HOME---> JRE -->lib---> security--> cacerts. You need to check where your JAVA_HOME is configured, possibly one of these places,
Computer--->Advanced --> Environment variables---> JAVA_HOME
Your server ...
How to change the type of a field?
...to change the $type from 1 (double) to 2 (string).
So simply load the document from the DB, perform the cast (new String(x)) and then save the document again.
If you need to do this programmatically and entirely from the shell, you can use the find(...).forEach(function(x) {}) syntax.
In respon...