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TypeScript, Looping through a dictionary
...
This is what I needed to get past the Typescript error on obj[key] "No index signature..." because I explicitly set my obj type as { [key: string]: string } and not wanted to use { [key: string]: any }. With this I can just access 'value'. Thanks
– g...
Why should I use an IDE? [closed]
...te imports in Java, using directives in C#)
Warning-as-you-type (i.e. some errors don't even require a compile cycle)
Hovering over something to see the docs
Keeping a view of files, errors/warnings/console/unit tests etc and source code all on the screen at the same time in a useful way
Ease of run...
Rails I18n validation deprecation warning
...
don't care about locales
true: if you
want the application to raise an error if an invalid locale is passed (or)
want to default to the new Rails behaviors (or)
care about locale validation
Note:
The old default behavior corresponds to false, not true.
If you are setting the config.i18n.def...
While loop to test if a file exists in bash
...some time.
PS This also causes an annoying number of "Stale file handler" errors.
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jQuery loop over JSON result from AJAX Success?
... //now you can access properties using dot notation
});
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("some error");
}
});
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When is null or undefined used in JavaScript? [duplicate]
... // false
z.xyz === undefined // true
null = 1; // throws error: invalid left hand assignment
undefined = 1; // works fine: this can cause some problems
So this is definitely one of the more subtle nuances of JavaScript. As you can see, you can override the value of undefine...
Apache Proxy: No protocol handler was valid
...s was happening for me in my Apache/2.4.18 (Ubuntu) setup. In my case, the error I was seeing was:
... AH01144: No protocol handler was valid for the URL /~socket.io/. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.
T...
Checking from shell script if a directory contains files
...xCraft's article posted in 2007. Add 2>/dev/null to suppress the output error "No such file or directory".
See also Andrew Taylor's answer (2008) and gr8can8dian's answer (2011).
if [ -n "$(ls -A your/dir 2>/dev/null)" ]
then
echo "contains files (or is a file)"
else
echo "empty (or does ...
MySQL Conditional Insert
...
Did you run your answer? I keep getting ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'where... (running 5.6.34)
– hlin117
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Java 8 Lambda function that throws exception?
...date: Looks like there's a very nice utility library part of Durian called Errors which can be used to solve this problem with a lot more flexibility. For example, in my implementation above I've explicitly defined the error handling policy (System.out... or throw RuntimeException), whereas Durian's...