Upwork JavaScript 1.8 Test Answers.

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Question.1:  Analyze the following code snippet. What will be the output of this code?
e. ain,ain (answer)

Question.2: Which of the following is the correct syntactical representation of a generator expression in JavaScript?

c. var doubles = (i * 2 for (i in it)); (answer)

Question.3: What is the output of the following JavaScript code?

s2 = new String(“2 + 2″)

document.write(eval(s2)); (answer)

Question.4: Consider the following code snippet. Which of the given options would be used in E4X to change the color of the descendant node chair?

a. element.chair.color=”light brown” (answer)

Question.5: Consider the code snippet below. Which of the given options represents the correct sequence of outputs when this code is executed in E4X?

var p1 = Kibology for all.

;

alert(p1.name().uri);

default xml namespace = ‘http://www.w3.org/1999/xhtml';

var p2 = Kibology for all.

;

alert(p2.name().uri);

default xml namespace = ”;

var p3 = Kibology for all.

;

alert(p3.name().uri);

d. None of the above (answer)

Question.6: Which of the following is not a valid JavaScript operator?

d. ^+ (answer)

Question.7: Which of the following is not a valid String method?

c. str()(answer)

Question.8: Which of the following methods is used to add and/or remove elements from an array and modify them in place?

d. splice (answer)

Question.9: In JavaScript, the encodeURI() function is used to encode special characters. Which of the following special characters is/are an exception to that rule?

e. a and b (answer)

Question.10: Which of the following is not a valid Date Object method in JavaScript?

c. setTime()(answer)

Question.11: Which of the following results is returned by the JavaScript operator “typeof” for the keyword “null”?

b. object (answer)

Question.12: Which of the following can be used to create attribute values by placing variables and expressions within them?

d. <> (answer)

Question.13: What will the function NaN return for the condition NaN == NaN?

b. false (answer)

Question.14: Which of the following modifiers must be set if we use the Javascript lastIndex Object Property during pattern matching?

d. s (answer)

Question.15: Which of the following two JavaScript code snippets is the more efficient and why?

CODE SNIPPET 1

CODE SNIPPET 2

d. The second code is more efficient because it employs object caching. (answer)

Question.16: Which of the following is used to solve the problem of enumerations in JavaScript?

c. Generators (answer)

Question.17: Is the following statement regarding expression closures in JavaScript true or false?

The syntax function(x) {return x*x;} can be written as function(x) x*x.

b. False (answer)

Question.18: Which of the given options represents the correct length when alert(Emp..*.length()); is applied to the following code?

var Emp =
Mark

Linux
Firefox
JavaScript
Python

a. 11 (answer)

Question.19: Analyze the following code snippet. What will be the output of this code?

a. now (answer)

Question.20: Which of the following is the correct way to create an XML object in E4X?

e. a and c (answer)

Question.21: Which of the following Array methods in JavaScript runs a function on every item in the Array and collects the result from previous calls, but in reverse?

c. reverse()(answer)

Question.22: Which of the following can be achieved using JavaScript?

d. All of the above can be achieved using JavaScript. (answer)

Question.23: Which of the following objects is the top-level object in the JavaScript hierarchy?

c. Window (answer)

Question.24: Which of the following Javascript Regular Expression modifiers finds one or more occurrences of a specific character in a string?

a. ? (answer)

Question.25: Which of the following is the correct syntax for using the Javascript exec() object method?

b. RegExpObject.exec(string) (answer)

Question.26: Analyze the following code using the source property of Regular Expressions. What will be the output of the below code snippet?

c. The regular expression is: enS (answer)

Question.27: Which of the following options can be used for adding direct support for XML to JavaScript?

a. E4X (answer)

Question.28: Which of the following options is used to access the attributes in E4X?

a. @ (answer)

Question.29: Which of the following statements regarding let in JavaScript is not correct?

c. The let keyword provides a way to associate values with variables within the scope of a block, and affects the values of like-named variables outside the block. (answer)

Question.30: Which of the following are not global methods and properties in E4X?

f. c and d (answer)

Question.31: What will be the output of the following code?

var x = 5;

var y = 0;

document.write( let(x = x + 10, y = 12) x+y + “,”);

document.write(x+y);

a. 27,5 (answer)

Question.32: Which of the following is not a valid method in generator-iterator objects in JavaScript?

a. send()(answer)

Question.33: Using the concept of “iterators” and “generators” in JavaScript, what will be the output of the following code?

function testGenerator()

{

yield “first”;

document.write(“step1″);

yield “second”;

document.write(“step2″);

yield “third”;

document.write(“step3″);

}

var g = testGenerator();

document.write(g.next());

document.write(g.next());

c. step1 (answer)

Question.34: Which of the following DOM objects can be used to determine the resolution of the screen?

b. Screen object (answer)

Question.35: Analyze the following code snippet. What will be the output of this code?

c. rose found. index now at: 8 (answer)

Question.36: Which of the following options can be used to delete a child node of an XML object in E4X?

d. All of the above (answer)

Question.37: Analyze the following code snippet, which uses a Javascript Regular Expression Character Set. What will be the output of this code?

a. I (answer)

Question.38: Consider the code below. What will be the final value of the variable “apt”?

var apt=2;

apt=apt<<2 data-blogger-escaped-p="">   

d. 8 (answer)

Question.39: Is the following statement true or false?

A function becomes a generator if it contains one or more yield statements.

a. True (answer)

Question.40: What does the following JavaScript code do?

a. The code will cause an error alert to be displayed if a numeric character is entered, and the numeric character is removed. (answer)

Question.41: Analyze the following code snippet. What will be the output of this code?

a. no (answer)

Question.42: Which of the following is the correct method for getting the date of February 1 of the current year into a variable called “newDate”?

c. var d = new Date();
newDate=new Date(d.getFullYear(), 1, 1); (answer)

Question.43: Which of the following can be used to create attribute values by placing variables and expressions within them?

c. {} (answer)

Question.44: Which of the following Javascript Regular Expression Character Classes finds any non-digit character in a given string?

d. \D (answer)

Question.45: Which of the following objects in JavaScript contains the collection called “plugins”?

b. Window (answer)

Question.46: Which of the following Javascript Regular Expression object methods is used to search a string for a specified value and return the result as true or false?

d. test()(answer)

Question.47: Which of the following methods is not a valid Array object method in JavaScript?

e. All of the above are valid. (answer)

Question.48: In an HTML page, the form tag is defined as follows:

http://www.mysite.com/”&gt

;

The validate() function is intended to prevent the form from being submitted if the name field in the form is empty. What will the validate() function look like?  

d. (answer)

Question.49: Which of the following is the correct way to create an XML object in E4X?

e. a and c (answer)

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