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What is the difference between IEqualityComparer and IEquatable?
...EqualityComparer<T>,
one could ask:
Is there a preferred way of testing two instances of T for equality, or are there several equally valid ways?
If there is only one way of testing two instances of T for equality, or if one of several methods is preferred, then IEquatable<T> wou...
How to check if the string is empty?
... then you should use myString == "". See the documentation on Truth Value Testing for other values that are false in Boolean contexts.
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How can I pretty-print JSON in a shell script?
...me issue, try this value: 1e1000. Note that python -mjson.tool fails this test badly in that it produces Infinity, which is not even JSON.
– peak
Sep 4 '15 at 2:38
...
Notepad++ add to every line
... expression option near the bottom of the dialog.
To add a word, such as test, at the beginning of each line:
Type ^ in the Find what textbox
Type test in the Replace with textbox
Place cursor in the first line of the file to ensure all lines are affected
Click Replace All button
...
Learning Ant path style
...a path variable named "spring"
Some examples:
com/t?st.jsp - matches com/test.jsp but also com/tast.jsp or com/txst.jsp
com/*.jsp - matches all .jsp files in the com directory
com/**/test.jsp - matches all test.jsp files underneath the com path
org/springframework/**/*.jsp - matches all .jsp files...
Including all the jars in a directory within the Java classpath
...e following:
Use straight quotes (")
Use *, not *.jar
Windows
java -cp "Test.jar;lib/*" my.package.MainClass
Unix
java -cp "Test.jar:lib/*" my.package.MainClass
This is similar to Windows, but uses : instead of ;. If you cannot use wildcards, bash allows the following syntax (where lib is the ...
How do you check if a JavaScript Object is a DOM Object?
...on't have HTMLElement and
//an exception is thrown and we end up here. Testing some
//properties that all elements have (works on IE7)
return (typeof obj==="object") &&
(obj.nodeType===1) && (typeof obj.style === "object") &&
(typeof obj.ownerDocument ...
Abort makefile if variable not set
...abs must precede these lines.
Generic solution
In case you're going to test many variables, it's worth defining an auxiliary function for that:
# Check that given variables are set and all have non-empty values,
# die with an error otherwise.
#
# Params:
# 1. Variable name(s) to test.
# 2. ...
Removing packages installed with go get
...cd /Users/ches/src/go/src/github.com/motemen/gore
rm -f gore gore.exe gore.test gore.test.exe commands commands.exe commands_test commands_test.exe complete complete.exe complete_test complete_test.exe debug debug.exe helpers_test helpers_test.exe liner liner.exe log log.exe main main.exe node node....
how to prevent “directory already exists error” in a makefile when using mkdir
...
You can use the test command:
test -d $(OBJDIR) || mkdir $(OBJDIR)
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