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| Section | Weight | Objectives |
|---|---|---|
| Browser and Events | 17% | - Event propagation (bubbling and capturing) - DOM manipulation - Event handling and listeners - Browser Developer Tools usage - Browser-specific APIs - Interacting with forms and user input |
| Asynchronous Programming | 13% | - Async/Await syntax - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Callbacks - Event loop and execution flow |
| Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging - Custom error types |
| Testing | 7% | - Test effectiveness evaluation - Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests |
| Variables, Types, and Collections | 23% | - Truthy and falsy evaluations - Variable declarations and initialization - Type coercion and conversion - Primitive and complex data types - Strings, numbers, and dates - Arrays and collections - JSON parsing and manipulation |
| Server Side JavaScript | 8% | - Server-side JavaScript implementations - Package management (npm) - Core Node.js modules - CLI commands - Node.js fundamentals |
| Objects, Functions, and Classes | 25% | - Modules and decorators - Execution flow and context - Prototypal inheritance - ES6 classes and inheritance - Arrow functions - Variable scope and closures - Object creation and manipulation - Higher-order functions - Function declarations and expressions |
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NEW QUESTION # 63
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
Answer: A,B
NEW QUESTION # 64
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
Answer: B,D
NEW QUESTION # 65
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button>
The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done make this code work as expected?
Answer: A
NEW QUESTION # 66
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.
Which two results occur when running this test on the updated sum3 function?
Choose 2 answers
Answer: B,D
NEW QUESTION # 67
Given the JavaScript below:
Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'
Answer: D
NEW QUESTION # 68
......
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