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Salesforce JavaScript Developer I Cert Practice Exam 2023/2024
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Salesforce JavaScript Developer I Cert Practice Exam 2023/2024 Which two syntax examples correctly initialize a value to the variable strLang? A. let strLang = 'javascript'; B. const strLang = 'java' + 'script'; C. let strLang = javascript; D. str strLang = 'javascript'; - ANSWER-ANSWER...

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  • August 11, 2023
  • 68
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • salesforce javascript developer i cert practice ex

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Salesforce JavaScript Developer I Cert
Practice Exam 2023/2024
Which two syntax examples correctly initialize a value to the variable strLang?



A. let strLang = 'javascript';

B. const strLang = 'java' + 'script';

C. let strLang = javascript;

D. str strLang = 'javascript'; - ANSWER-ANSWER:

A. let strLang = 'javascript';

B. const strLang = 'java' + 'script';



Additional Info:

Note that C doesn't have a value that has single quotes around the word 'javascript' and for D, 'str' is not
a proper identifier



Which statement sorts the following number array so it is in ascending order? const arr = [7, 3, 400, 10];



A. arr.sort();

B. arr.sort((a, b) => a - b);

C. arr.sort((a, b) => a < b);

D. arr.sort((a, b) => b - a); - ANSWER-ANSWER:

B. arr.sort((a, b) => a - b);



Additional Info:

A. The sort() function sorts values as strings, which will sort this as [10, 3, 400, 7].

C. The compare function expects a positive, negative, or 0 to be returned.

D. The compare function will actually reverse the order of the numbers.

,Which statement sorts the following string array so it is in descending order? const arr = ["Banana",
"Orange", "Apple", "Mango"];



A. arr.sort();

B. arr.sort((a, b) => a - b);

C. arr.reverse();

D. arr.sort((a, b) => b - a); - ANSWER-ANSWER:

C. arr.reverse();



Additional Info:

A. The sort() function sorts values as strings in ASCENDING order: ["Apple", "Banana", "Mango",
"Orange"];

B,D. Expect a number array.



What are the different data types used in JavaScript? - ANSWER-ANSWER:

There are 8 basic data types in JavaScript:

1. Number for numbers of any kind: integer or floating-point, integers are limited by ±((2^53)-1).



2. BigInt is for integer numbers of arbitrary length.



3. String for strings. A string may have zero or more characters, there's no separate single-character type.



4. Boolean for true/false.



5. NULL for unknown values - a standalone type that has a single value null. Note, typeof null returns
"object" even though it is NOT and object.



6. Undefined for unassigned values - a standalone type that has a single value undefined.



7. Object for more complex data structures.

,8. Symbol for unique identifiers.



Which collections of data are ordered by a key? - ANSWER-ANSWER:

Map and set objects.



What is the proper syntax for adding placeholders in template literals? - ANSWER-ANSWER:

Use a dollar sign followed by curly brackets:

${expression}.



Additional Info:

let name = "John";

// embed a variable

alert( `Hello, ${name}!` ); // Hello, John!



// embed an expression

alert( `the result is ${1 + 2}` ); // the result is 3



Note this only works if you use backticks, `, and not single(') or double(") quotes otherwise the results
will be shown as literal, ie: Hello, ${name}!



How do you instantiate a value as a BigInt?

A. Nothing, JavaScript will automatically cast a number to a BigInt if the value is greater than ((2^53) - 1)

B. const bigInt = BigInt.parse(1234567890123456789012345678901234567890);

C. const bigInt = 1234567890123456789012345678901234567890n;

D. const bigInt = BigInt.parse('1234567890123456789012345678901234567890'); - ANSWER-ANSWER:

C. const bigInt = 1234567890123456789012345678901234567890n;



Additional Info:

, BigInt does NOT work in IE.



Given the following Animal constructor:

function Animal(size, age) {

this.size = size;

this.age = age;

this.canTalk = false;

}

Which method creates a new instance of the object?

A. Object.create('Animal');

B. new Animal('large', 10);

C. Object.prototype(Animal);

D. Object.new(Animal); - ANSWER-ANSWER:

B. new Animal('large', 10);



Additional Info:

A. The create method needs the object name without quotes.

C. This is an incorrect way to use a prototype. Prototypes are used to add methods to existing
constructors.

D. This is not the correct way to use the new keyword. It is not a method.



A developer wants to use a module called DatePrettyPrint. This module exports one default function
called printDate().

How can a developer import and use the printDate() function?



A. import printDate() from '/path/DatePrettyPrint.js';

printDate();

B. import printDate from '/path/DatePrettyPrint.js';

printDate();

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