JavaScript: Closures And Statements Trivia Quiz
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Unlike a method a closure can only take one parameter.
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True
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False
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Dive into the intricacies of JavaScript with this trivia quiz focusing on closures and statement usage. Test your understanding of variable scoping, the behavior of closures, and compare JavaScript's features with other languages like Java and Groovy.
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- 2.
When you return from a closure which is called by an iterative method, you stop the iteration process.
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True
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False
Correct Answer
A. FalseExplanation
The iteration process continues on the remaining elements of the object that you are iterating over.Rate this question:
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- 3.
Groovy truth is identical to Java truth.
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True
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False
Correct Answer
A. FalseExplanation
There are subtle and important differences in truthiness between the two languages.Rate this question:
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- 4.
In Java the order of case branches within a switch statement is immaterial.
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True
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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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- 5.
The Groovy do statement is identical to Java's do statement.
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True
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False
Correct Answer
A. FalseExplanation
Groovy does not have a do statement (I don't know why).Rate this question:
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- 6.
Consider this Groovy method and its invocation: def foo() { def m = [:] m.a = 0 m.b = 1 } def val = foo() The variable val:
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Is of type Map
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Is undefined since foo has no return value
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Is of type Integer since the last statement of foo is of type Integer
Correct Answer
A. 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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- 7.
(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:
- 8.
Groovy does not have a way to test for reference equality.
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True
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False
Correct Answer
A. FalseExplanation
You test for reference equality by calling the is() method.Rate this question:
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- 9.
What does this code do? List numbers = [1,2,3,4] println numbers.collect{it * 2}
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Prints a list of the first four even numbers
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Prints four even numbers each on its own line
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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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- 10.
In JavaScript, the keyword _______ is used to declare a variable with block-level scope.
Correct Answer
let, Let, LETExplanation
In JavaScript, let is used to declare variables with block-level scope. This means the variable is only accessible within the code block (defined by curly braces {}) where it is declared. This allows for better control over variable visibility and helps prevent accidental modification or conflicts in larger programs.Rate this question:
- 11.
The Groovy for/in loop has the same syntax as Java's for/each loop.
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True
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False
Correct Answer
A. FalseExplanation
for (x in collection) {} // Groovyfor (x: collection) {} // JavaRate this question:
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Quiz Review Timeline (Updated): Oct 24, 2024 +
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Current Version
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Oct 24, 2024Quiz Edited by
ProProfs Editorial Team -
Nov 27, 2013Quiz Created by
Catherine Halcomb
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