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Salesforce JAVASCRIPT-DEVELOPER-I Online Practice Questions and Exam Preparation

JAVASCRIPT-DEVELOPER-I Exam Details

  • Exam Code
    :JAVASCRIPT-DEVELOPER-I
  • Exam Name
    :Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Certification
    :Salesforce Certifications
  • Vendor
    :Salesforce
  • Total Questions
    :223 Q&As
  • Last Updated
    :Jul 04, 2026

Salesforce JAVASCRIPT-DEVELOPER-I Online Questions & Answers

  • Question 201:

    Consider type coercion, what does the following expression evaluate to? True + 3 + `100' + null

    A. 104
    B. 4100
    C. `3100null'
    D. `4100null'

  • Question 202:

    Refer to thecode below:

    let sayHello = () => {

    console.log (`Hello, world!');

    };

    Which code executes sayHello once, two minutes from now?

    A. setTimeout(sayHello, 12000);
    B. setInterval(sayHello, 12000);
    C. setTimeout(sayHello(), 12000);
    D. delay(sayHello, 12000);

  • Question 203:

    Refer to code below:

    Let productSKU = `8675309' ;

    A developer has a requirement to generate SKU numbers that are always 19 characters lon,

    starting with `sku', and padded with zeros.

    Which statement assigns the values sku0000000008675309 ?

    A. productSKU = productSKU .padStart (19. `0').padstart(`sku');
    B. productSKU = productSKU .padEnd (16. `0').padstart(`sku');
    C. productSKU = productSKU .padEnd (16. `0').padstart(19, `sku');
    D. productSKU = productSKU .padStart (16. `0').padstart(19, `sku');

  • Question 204:

    Refer to the code below:

    What is the result when the Promise in the execute function is rejected?

    A. Resolved1 Resolved2 Resolved3 Resolved4
    B. Rejected
    C. Rejected Resolved
    D. Rejected1 Rejected2 Rejected3 Rejected Rejected Rejected4

  • Question 205:

    A developer has an is Dog function that takes one argument cat. They want to schedule the function to run everyminute. What is the correct syntax for scheduling this function?

    A. setInterval(isDog, 60000,'cat');
    B. PlaceHolder
    C. PlaceHolder
    D. PlaceHolder

  • Question 206:

    Refer to the following code:

    Let sampleText = `The quick brown fox jumps';

    A developer needs to determine if a certainsubstring is part of a string.

    Which three expressions return true for the given substring ?

    Choose 3 answers

    A. sampleText.includes(`fox');
    B. sampleText.includes(` quick ', 4);
    C. sampleText.includes(` Fox ', 3)
    D. sampleText.includes(` fox ');
    E. sampleText.includes(` quick ') !== -1;

  • Question 207:

    Refer to the expression below:

    Let x =(`1' + 2) == (6 * 2);

    How should this expression be modified to ensure that evaluates to false?

    A. Let x = (`1' + ` 2') == ( 6 * 2);
    B. Let x = (`1' + 2) == ( 6 * 2);
    C. Let x = (1 + 2) == ( `6' / 2);
    D. Let x = (1 + 2 ) == ( 6 / 2);

  • Question 208:

    Refer to the code below:

    Click me!

    Which code change should be made for the console to log only Row log when `Click me! ' is clicked?

    A. Add.event.stopPropagation(); to window.onLoad event handler.
    B. Add event.stopPropagation(); to printMessage function.
    C. Add event.removeEventListener(); to window.onLoad event handler.
    D. Add event.removeEventListener(); toprintMessage function.

  • Question 209:

    A developer is required to write a function that calculates the sum of elements in an array but is getting undefinedevery time the code is executed. The developer needs to find what is missing in the code below.

    Const sumFunction = arr => {

    Return arr.reduce((result, current) => {

    //

    Result += current;

    //

    ), 10);

    );

    Which option makes the code work as expected?

    A. Replace line 02 with return arr.map(( result, current) => (
    B. Replace line 04 with result = result +current;
    C. Replace line 03 with if(arr.length == 0 ) ( return 0; )
    D. Replace line 05 with return result;

  • Question 210:

    Universal Containers (UC) just launched a new landing page, but users complain that thewebsite is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.

    Which function can the developer use to obtain the time spent by every one of the three functions?

    A. console. timeLog ()
    B. console.timeStamp ()
    C. console.trace()
    D. console.getTime ()

    • Related Exams:

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