JavaScript MCQs with answers Page - 73

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Q. Which method of the iterable object returns an iterator object for the collection?

• (A) iterator()
• (B) _iterator_()
• (C) _iteration_()
• (D) _return_iterator_()

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Correct answer - Option (B)

Explanation:

An iterable object represents a collection of values that can be iterated. An iterable object must define a method named __iterator__() (with two underscores at the start and end of the name) which returns an iterator object for the collection.

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Q. Consider the following code snippet
let succ = function(x) x+1, yes = function() true, no = function() false;
What convenience does the above code snippet provide?

• (A) Functional behaviour
• (B) Modular behaviour
• (C) No convenience
• (D) Shorthand expression

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Correct answer - Option (A)

Explanation:

The functions defined in this way behave exactly like functions defined with curly braces and the return keyword.

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Q. Consider the following code snippet
data.sort(function(a,b),b-a);
What does the above code do?

• (A) Sort in the alphabetical order
• (B) Sort in the chronological order
• (C) Sort in reverse alphabetical order
• (D) Sort in reverse numerical order

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Correct answer - Option (D)

Explanation:

The above code snippet sorts an array in reverse numerical order.

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Q. The libraries that build a new higher-level API for client-side programming is

• (A) Library
• (B) Framework
• (C) APIs
• (D) All of the mentioned

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Correct answer - Option (B)

Explanation:

Many web developers find it useful to build their web applications on top of a clientside framework library. These libraries are “frameworks” in the sense that they build a new higher-level API for client-side programming on top of the standard and proprietary APIs offered by web browsers: once you adopt a framework, your code needs to be written to use the APIs defined by that framework.

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Q. Which of the following is not a framework?

• (A) jQuery
• (B) .NET
• (C) JavaScript
• (D) None of the mentioned

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Correct answer - Option (C)

Explanation:

One of the most popular frameworks is jQuery. Here, JavaScript is a scripting language and not a framework.

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Q. Which of the following frameworks focuses on DOM and Ajax utilities?

• (A) jQuery
• (B) Prototype
• (C) Dojo
• (D) Both jQueryand Prototype

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Correct answer - Option (D)

Explanation:

The Prototype library focuses on DOM and Ajax utilities like jQuery does, and adds quite a few core-language utilities as well.

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Q. What is the purpose of Dojo framework?

• (A) Focuses on DOM and Ajax utilities
• (B) Advertises incredible depth
• (C) Ajax utilities
• (D) None of the mentioned

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Correct answer - Option (B)

Explanation:

Dojo is a large framework that advertises its “incredible depth.” It includes an extensive set of UI widgets, a package system, a data abstraction layer, and more.

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Q. Which is the in-house library of Yahoo!?

• (A) Dojo
• (B) YUI
• (C) Prototype
• (D) Closure

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Correct answer - Option (B)

Explanation:

YUI is the in-house library of Yahoo!, and it is used on their home page.

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Q. What does Dojo and YUI have in common?

• (A) Facilitates DOM utilities and UI Widgets
• (B) Doesnot facilitates DOM utilities and UI Widgets
• (C) Client-side library
• (D) None of the mentioned

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Correct answer - Option (A)

Explanation:

Like Dojo, it is a large, all-encompassing library with language utilities, DOM utilities, UI widgets, and so on. There are actually two incompatible versions of YUI, known as YUI 2 and YUI 3.

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Q. What are the two incompatible versions of YUI?

• (A) YUI1 and YUI2
• (B) YUI2 and YUI4
• (C) YUI1 and YUI3
• (D) YUI2 and YUI3

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Correct answer - Option (A)

Explanation:

Like Dojo, it is a large, all-encompassing library with language utilities, DOM utilities, UI widgets, and so on. There are actually two incompatible versions of YUI, known as YUI 2 and YUI 3.

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