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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browser and Events | 17% | - Browser Developer Tools usage - Browser-specific APIs - DOM manipulation - Event propagation (bubbling and capturing) - Event handling and listeners - Interacting with forms and user input |
| Topic 2: Objects, Functions, and Classes | 25% | - Arrow functions - Variable scope and closures - Execution flow and context - Object creation and manipulation - Prototypal inheritance - Higher-order functions - Function declarations and expressions - Modules and decorators - ES6 classes and inheritance |
| Topic 3: Server Side JavaScript | 8% | - Core Node.js modules - Server-side JavaScript implementations - Package management (npm) - CLI commands - Node.js fundamentals |
| Topic 4: Testing | 7% | - Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability |
| Topic 5: Variables, Types, and Collections | 23% | - Variable declarations and initialization - Primitive and complex data types - JSON parsing and manipulation - Strings, numbers, and dates - Type coercion and conversion - Arrays and collections - Truthy and falsy evaluations |
| Topic 6: Asynchronous Programming | 13% | - Event loop and execution flow - Promises (creation, chaining, error handling) - Async/Await syntax - Asynchronous patterns for business requirements - Callbacks |
| Topic 7: Debugging and Error Handling | 7% | - Custom error types - Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection |
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NEW QUESTION # 93
Code:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after execution?
Answer: B
Explanation:
Initial array:
[1, 2, 3, 4, 4, 5, 4, 4]
The loop removes every value equal to 4:
* array.splice(i, 1) removes the element at index i and shifts all later elements left.
* i-- ensures the next index is checked correctly after the shift, preventing skipping elements.
Step-by-step removal:
* Remove the first 4 # array becomes [1,2,3,4,5,4,4]
* Remove next 4 # [1,2,3,5,4,4]
* Remove next 4 # [1,2,3,5,4]
* Remove last 4 # [1,2,3,5]
Final result:
[1,2,3,5]
Option B is correct.
JavaScript Knowledge References (text-only)
* splice(index, deleteCount) removes elements and shifts remaining items.
* Adjusting the loop index when deleting prevents skipping items.
* Arrays update length dynamically after splice().
NEW QUESTION # 94
Given the code below.
What is logged to the console?
Answer: A
NEW QUESTION # 95
Refer to the code below?
Let searchString = ' look for this ';
Which two options remove the whitespace from the beginning of searchString?
Choose 2 answers
Answer: A,C
NEW QUESTION # 96
Refer to the code below:
let timeFunction =() => {
console.log('Timer called.");
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?
Answer: B
NEW QUESTION # 97
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?
Answer: B
NEW QUESTION # 98
......
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