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NullReferenceException is thrown whenever a variable is empty and one of its method/properties are referenced. To avoid this, be sure all variables are initialized correctly (new operator), and all methods returns a non-null value.

ParamenterDescriptionactionIt must be an object with at least the type property. Any other property can be passed and will be accessible within the reducer function. If you're not using bundlers like Webpack and Browserify, change the first line to: const { createStore } = Redux; Or just call...

EXCEPT returns any distinct values from the dataset to the left of the EXCEPT operator that are not also returned from the right dataset.

A text object in Vim is another way to specify a chunk of text to operate on. They can be used with operators or in visual mode, instead of motions.

XPath expressions are used to navigate and select one or more nodes within an XML tree document, such as selecting a certain element or attribute node. See this W3C recommendation for a reference on this language.

-A, -B and -C options are not available in POSIX (see the POSIX specifications for grep).

aThirdFun(anotherFun(myFun(), 42); // common notation (also valid) myFun().anotherFun(42).aThirdFun(); // UFCS myFun.anotherFun(42).aThirdFun; // empty braces can be removed In a call a.b(args...), if the type a does not have a method named b, then the compiler will try to rewrite the cal...

To render fonts correctly in pdf font-extensions should always be used (in classpath)

Everything related to TextView customization in Android SDK TextView (Context context) (TextView)findViewById(int id) void setText (int resid) void setText (CharSequence text)//You can use String as an argument Try to use it in xml design or programmatically.

The filename AssemblyInfo.cs is used by convention as the source file where developers place metadata attributes that describe the entire assembly they are building.

RSpec::Expectations lets you express expected outcomes on an object using an example-based DSL syntax. This topic gives examples of how to expect test results in RSpec using expect .to and the many built-in matchers. This functionality is provided by the rspec-expectations gem.

<<internal-code-chunk-name, options...>>= # R Code Here @ \Sexpr{ #R Code Here } << read-external-R-file >>= read_chunk('r-file.R') @ <<external-code-chunk-name, options...>>= @ OptionDetailsecho(TRUE/FALSE) - whether to include R source code in...

class ClassName(MainClass, Mixin1, Mixin2, ...): # Used to declare a class with the name ClassName, main (first) class MainClass, and mixins Mixin1, Mixin2, etc. class ClassName(Mixin1, MainClass, Mixin2, ...): # The 'main' class doesn't have to be the first class; there's really no difference be...