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What is the difference between parseInt() and Number()?
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Well, they are semantically different, the Number constructor called as a function performs type conversion and parseInt performs parsing, e.g.:
// parsing:
parseInt("20px"); // 20
parseInt("10100", 2); // 20
parseInt("2e1"); // 2
/...
Bash script processing limited number of commands in parallel
... the exit status of the last
command waited for. If a job spec is given, all processes in the job
are waited for. If no arguments are given, all currently active child
processes are waited for, and the return status is zero. If neither
jobspec nor pid specifies an active child process of the...
return query based on date
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You probably want to make a range query, for example, all items created after a given date:
db.gpsdatas.find({"createdAt" : { $gte : new ISODate("2012-01-12T20:15:31Z") }});
I'm using $gte (greater than or equals), because this is often used for date-only queries, where the t...
What is the difference between min SDK version/target SDK version vs. compile SDK version?
...e earliest release of the Android SDK that your application can run on. Usually this is because of a problem with the earlier APIs, lacking functionality, or some other behavioural issue.
The target sdk version is the version your application was targeted to run on. Ideally, this is because of some...
Reflection: How to Invoke Method with parameters
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Change "methodInfo" to "classInstance", just like in the call with the null parameter array.
result = methodInfo.Invoke(classInstance, parametersArray);
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Meteor test driven development [closed]
...ractices before establishing anything in the official documentation. After all, Meteor reached 0.5 this week, and things are still changing rapidly.
The good news: you can use Node.js testing tools with Meteor.
For my Meteor project, I run my unit tests with Mocha using Chai for assertions. If you...
Understanding FFT output
...sqrt (real * real + imag * imag). This number will always be positive. Now all you have to search is for the maximum value (ignore the first entry in your array. That is your DC offset and carries no frequency dependent information).
You get 32 real and 32 imaginary outputs because you are using a ...
Counting null and non-null values in a single query
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If I understood correctly you want to count all NULL and all NOT NULL in a column...
If that is correct:
SELECT count(*) FROM us WHERE a IS NULL
UNION ALL
SELECT count(*) FROM us WHERE a IS NOT NULL
Edited to have the full query, after reading the comments :]
S...
javax.faces.application.ViewExpiredException: View could not be restored
...ession cookie is not maintained anymore for some reason in browser, or by calling HttpSession#invalidate() in server, or due a server specific bug with session cookies as known in WildFly), then the serialized view state is not available anymore in the session and the enduser will get this exception...
How to tell if a string contains a certain character in JavaScript?
...tion does. There are a lot of people who don't understand regex, and generally the simpler answer is the best.
– kemiller2002
Oct 13 '15 at 19:19
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