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What Android tools and methods work best to find memory/resource leaks? [closed]
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One of the most common errors that I found developing Android Apps is the “java.lang.OutOfMemo...
Get timezone from DateTime
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answered Feb 23 '09 at 7:07
Jon SkeetJon Skeet
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Printing 1 to 1000 without loop or conditionals
Task : Print numbers from 1 to 1000 without using any loop or conditional statements. Don't just write the printf() or cout statement 1000 times.
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Subset of rows containing NA (missing) values in a chosen column of a data frame
....na() instead. This should do it:
new_DF <- DF[rowSums(is.na(DF)) > 0,]
or in case you want to check a particular column, you can also use
new_DF <- DF[is.na(DF$Var),]
In case you have NA character values, first run
Df[Df=='NA'] <- NA
to replace them with missing values.
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Ruby - test for array
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edited Mar 30 at 18:35
siery
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answered Oct 6 '09 at 20...
How can I generate Unix timestamps?
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In Linux or MacOS you can use:
date +%s
where
+%s, seconds since 1970-01-01 00:00:00 UTC. (GNU Coreutils 8.24 Date manual)
Example output now 1454000043.
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Split string to equal length substrings in Java
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How can I view array structure in JavaScript with alert()?
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answered Jun 9 '10 at 14:15
HumbertoHumberto
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Query-string encoding of a Javascript Object
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How to check whether a string is a valid HTTP URL?
...eHttp;
Or, if you want to accept both HTTP and HTTPS URLs as valid (per J0e3gan's comment):
Uri uriResult;
bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult)
&& (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
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