©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
Salesforce JavaScript Developer I Cert
Practice Exam Questions and Answers
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:
Page 1/125
, ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
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.
Page 2/125
, ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
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:
Page 3/125
, ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
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.
Page 4/125
FIRST PUBLISH OCTOBER 2024
Salesforce JavaScript Developer I Cert
Practice Exam Questions and Answers
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:
Page 1/125
, ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
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.
Page 2/125
, ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
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:
Page 3/125
, ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED
FIRST PUBLISH OCTOBER 2024
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.
Page 4/125
