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What does data (->) a b mean?

haskell ghci

Repeating a string using StringBuilder

c# string stringbuilder

Docker cp error: Path not specified

docker cp

(java.security.InvalidKeyException) No IV set when one expected error at cipher.init(Cipher.DECRYPT_MODE, key)

java encryption

Gate::allows not working in Laravel 5.3

How to randomly select a format string

Clip children of custom qml item after custom shape

c++ qt qml qtquick2 qquickitem

Does Haskell provide an idiom for pattern matching against many possible data constructors?

How to return a vector of boxed traits using map (functional rather than imperative)

rust traits

How to show a background image in ruby on rails

Finding the maximum value in an array but must be lower than a certain value

java

Angular ng-repeat. Looping through the letters in string

Adding new column with diff() function when there is one less row in R

r diff

Getting Pixel Color from an Image using CGPoint in Swift 3

image pixel swift3 cgpoint

when calling the ListObjects operation: Missing required header for this request: x-amz-content-sha256

Is it doable to collect user fingerprint with android?

android fingerprint

variadic templates with template function names

Create new column in pandas based on value of another column

python pandas

How to generate engraving effect in CSS?

css

What are the alternatives to OR'ing multiple value options in an IF clause?

c# if-statement