JavaScript: Closures And Statements Trivia Quiz
Questions on closures, groovy truth, control structures, miscellaneous. Abc
- 1.
(Fill in the blank) A closure acts like a _______ in the context of an iterative method.
Explanation
In the context of an iterative method, e.g. collection.each, a closure acts like a callback.Rate this question:
- 2.
Unlike a method a closure can only take one parameter.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A closure is very much like a method and can take any number of parameters.Rate this question:
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- 3.
When you return from a closure which is called by an iterative method, you stop the iteration process.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The iteration process continues on the remaining elements of the object that you are iterating over.Rate this question:
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- 4.
Groovy truth is identical to Java truth.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
There are subtle and important differences in truthiness between the two languages.Rate this question:
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- 5.
In Java the order of case branches within a switch statement is immaterial.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This is true because Java is very restrictive on the types that you can switch on.Rate this question:
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- 6.
The Groovy do statement is identical to Java's do statement.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Groovy does not have a do statement (I don't know why).Rate this question:
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- 7.
Consider this Groovy method and its invocation: def foo() { def m = [:] m.a = 0 m.b = 1 } def val = foo() The variable val:
- A.
Is of type Map
- B.
Is undefined since foo has no return value
- C.
Is of type Integer since the last statement of foo is of type Integer
Correct Answer
C. Is of type Integer since the last statement of foo is of type IntegerExplanation
Here the return statement is implicitly the last statement.Rate this question:
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- 8.
(Fill in the blank) The _____ operator invokes the compareTo method of a class that implements the Comparable interface.
Correct Answer
<=>
spaceshipExplanation
The spaceship operator is used to invoke the compareTo method of a class that implements the Comparable interface. This operator is typically used to compare two objects and determine their relative order.Rate this question:
- 9.
Groovy does not have a way to test for reference equality.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
You test for reference equality by calling the is() method.Rate this question:
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- 10.
What does this code do? List numbers = [1,2,3,4] println numbers.collect{it * 2}
- A.
Prints a list of the first four even numbers
- B.
Prints four even numbers each on its own line
- C.
Prints the variable numbers itself
Correct Answer
A. Prints a list of the first four even numbersExplanation
The collect() method returns a list of four even numbers to the println() method.Rate this question:
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- 11.
The Groovy for/in loop has the same syntax as Java's for/each loop.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
for (x in collection) {} // Groovyfor (x: collection) {} // JavaRate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Nov 27, 2013Quiz Created by
Catherine Halcomb
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