JavaScript: Closures And Statements Trivia Quiz

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| By Catherine Halcomb
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Catherine Halcomb
Community Contributor
Quizzes Created: 1429 | Total Attempts: 6,058,033
Questions: 11 | Attempts: 213

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Java Quizzes & Trivia

Questions on closures, groovy truth, control structures, miscellaneous. Abc


Questions and Answers
  • 1. 

    (Fill in the blank) A closure acts like a _______ in the context of an iterative method.

    Correct Answer
    callback
    call back
    Explanation
    In the context of an iterative method, e.g. collection.each, a closure acts like a callback.

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  • 2. 

    Unlike a method a closure can only take one parameter.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    A closure is very much like a method and can take any number of parameters.

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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. False
    Explanation
    The iteration process continues on the remaining elements of the object that you are iterating over.

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  • 4. 

    Groovy truth is identical to Java truth.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    There are subtle and important differences in truthiness between the two languages.

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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. True
    Explanation
    This is true because Java is very restrictive on the types that you can switch on.

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  • 6. 

    The Groovy do statement is identical to Java's do statement.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Groovy does not have a do statement (I don't know why).

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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 Integer
    Explanation
    Here the return statement is implicitly the last statement.

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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
    <=>
    spaceship
    Explanation
    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.

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  • 9. 

    Groovy does not have a way to test for reference equality.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    You test for reference equality by calling the is() method.

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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 numbers
    Explanation
    The collect() method returns a list of four even numbers to the println() method.

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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. False
    Explanation
    for (x in collection) {} // Groovyfor (x: collection) {} // Java

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 27, 2013
    Quiz Created by
    Catherine Halcomb
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