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| Section | Objectives |
|---|---|
| Browser and DOM Interaction | - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal - Event handling and propagation |
| Salesforce Platform Integration | - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript |
| Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| JavaScript Language Fundamentals | - Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features |
| Asynchronous JavaScript | - Error handling in async workflows - Event loop and concurrency model - Promises and async/await |
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NEW QUESTION # 140
Considering type coercion, what does the following expression evaluate to?
True + '13' + NaN
Answer: D
NEW QUESTION # 141
A developer is required to write a function that calculates the sum of elements in an
array but is getting undefined every 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?
Answer: D
NEW QUESTION # 142
The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers
Answer: A,D
NEW QUESTION # 143
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an Implementation from one team:
What is the output of the code execution?
Answer: B
NEW QUESTION # 144
let sampleText = " The quick brown fox jumps " ;
Which three expressions return true for a substring?
Answer: B,C,D
Explanation:
The correct answers are A, B, and C .
The original variable name appears to contain a typing error. The variable should be used consistently as sampleText:
let sampleText = " The quick brown fox jumps " ;
A is correct because includes() checks whether a string contains a specific substring and returns a Boolean value:
sampleText.includes( ' fox ' );
Since " fox " exists inside " The quick brown fox jumps " , this returns:
true
B is correct after correcting the typing error. The correct expression is:
sampleText.indexOf( ' quick ' ) > -1;
indexOf() returns the index position where the substring is found. If the substring is not found, it returns -1.
Since " quick " exists in the string, sampleText.indexOf( ' quick ' ) returns a value greater than -1, so the expression returns:
true
C is correct after correcting the missing quotation marks and adding a Boolean comparison:
sampleText.indexOf( ' fox ' ) !== -1;
The substring " fox " exists in the string, so indexOf( ' fox ' ) does not return -1. Therefore, the expression returns:
true
D is incorrect because the method name is typed incorrectly. JavaScript string has includes(), not include().
Incorrect:
sampleText.include( ' fox ' )
Correct:
sampleText.includes( ' fox ' )
E is incorrect because JavaScript string matching is case-sensitive:
sampleText.indexOf( ' Quick ' ) !== -1;
The string contains " quick " with a lowercase q, not " Quick " with an uppercase Q, so this returns:
false
Therefore, the verified answers are A, B, and C .
NEW QUESTION # 145
......
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