Prototype JavaScript Framework Interview Questions & Answers

  1. Question 1. What Is Prototype?

    Answer :

    • Prototype is a JavaScript framework which is used in dynamic web applications.
    • It is a namespace and a module that is used to manage HTML forms.
    • It is also a JavaScript Library.
  2. Question 2. Who Is The Developer Of Prototype?

    Answer :

    Sam Stephenson is the developer of Prototype.

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  4. Question 3. What Are The Features Of Prototype?

    Answer :

    The features of Prototype are:

    • Extends DOM elements.
    • Powerful Ajax features.
    • Does not provide widgets.
    • Advanced support for event management.
    • It is not a complete application development framework.
    • Built-in support for class-style OOP including inheritance.
  5. Question 4. What Is Underscore () Method In Prototype String Method?

    Answer :

    underscore () method: This method is used to converts a String into a series of words separated by an underscore.

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  7. Question 5. What Is Inspect () Method In Prototype String Method?

    Answer :

    inspect () method: This method is used to returns a debug-oriented version of the string.

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  9. Question 6. What Is Empty () Method In Prototype Element Method?

    Answer :

    empty () method is used to check whether the element is empty or not.

  10. Question 7. What Is Templates In Prototype?

    Answer :


    • It is used for formatting group of similar objects.
    • It is also used to produce formatted output for these objects.
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  12. Question 8. What Are The Steps To Create The Formatted Output In Prototype?

    Answer :

    The steps to create the formatted output are:

    Step 1: Create a template.

    Step 2: Defining actual values.

    Step 3: Mapping Keys and replacing Values.

  13. Question 9. What Is Include () Method In Prototype?

    Answer :

    include method: This method is used to determine whether the value is included in the range or not.

    If the value is included, then returns true otherwise returns false.

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  15. Question 10. What Is $a () Method In Prototype?

    Answer :

    $A () method: This method is used to converts the single argument it receives into an array object.

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  17. Question 11. What Is $w () Method In Prototype?

    Answer :

    The $w () method is used to splits a string into an array.

    Here, all whitespace are treated as delimiters.

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  19. Question 12. What Is Ajax In Prototype?

    Answer :

    • AJAX stands for Asynchronous JavaScript and XML.
    • It is a technique which is used for creating faster, better and more interactive web applications.
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  21. Question 13. What Is Date.tojson () In Prototype?

    Answer :

    The Date.toJSON () method is used to convert the date into a JSON string.

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  23. Question 14. What Are The Ways To Construct A Hash Instance In Prototype?

    Answer :

    Two ways to construct a Hash instance are:

    • By using new JavaScript keyword.
    • By using $H(Prototype Utility function).
  24. Question 15. What Is The Use Of Periodical Executor Object?

    Answer :

    Periodical Executor object: It is used to execute a function many times after a certain period of time.

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  26. Question 16. What Is The Major Advantage Of Periodical Executor?

    Answer :

    The major advantage of Periodical Executor is: Periodical Executor shields you against multiple parallel executions of the callback function.

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  28. Question 17. What Is The Syntax Of $r Utility Function In Prototype?

    Answer :

    The syntax of $R utility function is: $R(start, end[, exclusive = false]);


    $R (1, 10).inspect ();

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  30. Question 18. What Are The Ajax Methods Available In Prototype?

    Answer :

    The AJAX methods available in Prototype are:

    • Ajax Options
    • Ajax.PeriodicalUpdater ()
    • Ajax. Request ()
    • Ajax. Responders ()
    • Ajax. Response ()
    • Ajax. Updater ()
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  32. Question 19. Name Some Callbacks That Are Not Implemented By All Browsers?

    Answer :

    Callbacks that are not implemented by all browsers are:

    • On Loaded
    • On Loading
    • On Interactive
    • On Uninitialized
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  34. Question 20. What Are The Methods Provided By Json For Encoding In Prototype?

    Answer :

    The methods provided by JSON for Encoding are:

    • Number.toJSON ()
    • String.toJSON ()
    • Array.toJSON ()
    • Hash.toJSON ()
    • Date.toJSON ()
    • Object.toJSON ()
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  36. Question 21. What Are The Features Of Json (javascript Object Notation)?

    Answer :

    The features of JSON are:

    • JSON is a lightweight data-interchange format.
    • Easy to read and write for humans.
    • Easy to parse and generate for machines.
    • Based on JavaScript Programming Language.
    • Completely language independent.
  37. Question 22. What Is The Use Of $h Method In Prototype?

    Answer :

    $H method: This method is used to convert object into enumerable Hash object.

    Syntax: $H ([obj])

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  39. Question 23. What Will Be The Output Of The Following Code Snippet?

    Answer :

    var anyObject = {};  

    [‘foo’, ‘Tuto’, ‘rial’].each(function(name, index) {  

    this[name] = index;  

    }, anyObject);   


    Output: {foo: 0, Tuto: 1, rial: 2}

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  41. Question 24. What Is The Syntax Of Pluck () Method In Prototype?

    Answer :

    The syntax of pluck () method is: Iterator. Pluck (property Name);

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  43. Question 25. What Is The Use Of Is Hash () Method In Prototype?

    Answer :

    is Hash() method: Returns true if object is an instance of the Hash class, Otherwise returns false.

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  45. Question 26. What Are The Form Methods Available In Prototype?

    Answer :

    The form methods available in Prototype are:

    • Disabled ()
    • Enable ()
    • Find First Element ()
    • Focus First Element ()
    • Getelements ()
    • Get Inputs ()
    • Request ()
    • Reset ()
    • Serialize ()
    • Serialize Elements ()
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  47. Question 27. What Is The Use Of Json () Method In Prototype?

    Answer :

    JSON () method: It is used to check the string is valid JSON with the help of regular expressions.

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