What does << mean in groovy?

In regular Java (and pretty much anywhere else) it means a bitwise left shift on numbers: assert (1<<4)==16. But Groovy allows overloading operators and in the examples mentioned it is means, what it is overloaded with (use of the method a. leftShift(b) ).

What does >> mean in Spock?

The right-shift ( >> ) operator defines the return value or behavior of a stubbed method. You can find more information under Stubbing in the reference documentation.

How do I use or operator in Groovy?

Groovy offers three logical operators for boolean expressions: && : logical “and” || : logical “or”…3. Logical operators.

1	“not” false is true
3	true “or” false is true

What are bitwise operators in Groovy?

Groovy – Bitwise Operators

Sr.No	Operator & Description
1	& This is the bitwise “and” operator
2	| This is the bitwise “or” operator
3	^ This is the bitwise “xor” or Exclusive or operator
4	~ This is the bitwise negation operator

Is Groovy null safe?

Fortunately, with Groovy this is very easy. Use the Safe Navigation (or null-safe) operator which guards against NullPointerExceptions.

What is Groovy assert?

An assertion is similar to an if, it verifies the expression you provide: if the expression is true it continues the execution to the next statement (and prints nothing), if the expression is false, it raises an AssertionError.

Is Spock using JUnit?

Both Groovy and Java build and run on the JVM. A large enterprise build can run both JUnit and Spock tests in the same time. Spock uses the JUnit runner infrastructure and therefore is compatible with all existing Java infrastructure.

What is ternary operator in Java?

Java ternary operator is the only conditional operator that takes three operands. It’s a one-liner replacement for if-then-else statement and used a lot in Java programming. We can use the ternary operator in place of if-else conditions or even switch conditions using nested ternary operators.

Why was Elvis an operator?

The name “Elvis operator” refers to the fact that when its common notation,?: , is viewed sideways, it resembles an emoticon of Elvis Presley with his quiff, or in the other direction, his smirk.

Is empty in Groovy?

Groovy – isEmpty() Returns true if this List contains no elements.

What is Groovy test?

Advertisements. The fundamental unit of an object-oriented system is the class. Therefore unit testing consists of testig within a class. The approach taken is to create an object of the class under testing and use it to check that selected methods execute as expected.

Is Spock better than JUnit?

As we can see, Spock has more readability and a clearer documented code, it does not need 3rd parties, and it is more powerful than JUnit. In the end, using Spock or JUnit or TestNG or anything else is absolutely up to you.

What is the use of left shift operator?

Left Shifts The left-shift operator causes the bits in shift-expression to be shifted to the left by the number of positions specified by additive-expression. The bit positions that have been vacated by the shift operation are zero-filled.

What does the << operator do in Groovy?

What does it do in groovy? Show activity on this post. The << is a left-shift operator. In this scenario, task “task$counter” is a Task object declaration, and << is overloaded as an alias to the doLast method, which appends the closure to the list of actions to perform when executing the task.

How do I override bitwise operators in Groovy?

In groovy, the bitwise operators can be overridden with the leftShift (<<)and rightShift (>>)methods defined on the class. It’s idiomatic groovy to use the leftShiftmethod for append actions on strings, buffers, streams, arrays, etc and thats what you’re seeing here.

What is a left shift in C++?

Left Shifts. The left-shift operator causes the bits in shift-expression to be shifted to the left by the number of positions specified by additive-expression.The bit positions that have been vacated by the shift operation are zero-filled. A left shift is a logical shift (the bits that are shifted off the end are discarded, including the sign bit).