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| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Arrow functions - Object creation and manipulation - Higher-order functions - Execution flow and context - Prototypal inheritance - Variable scope and closures - Function declarations and expressions - Modules and decorators - ES6 classes and inheritance |
| Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Event loop and execution flow - Async/Await syntax - Callbacks |
| Server Side JavaScript | 8% | - Server-side JavaScript implementations - CLI commands - Core Node.js modules - Package management (npm) - Node.js fundamentals |
| Testing | 7% | - Test coverage and reliability - Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests |
| Variables, Types, and Collections | 23% | - Strings, numbers, and dates - JSON parsing and manipulation - Type coercion and conversion - Primitive and complex data types - Arrays and collections - Variable declarations and initialization - Truthy and falsy evaluations |
| Debugging and Error Handling | 7% | - Custom error types - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) |
| Browser and Events | 17% | - Event handling and listeners - Browser-specific APIs - Interacting with forms and user input - Event propagation (bubbling and capturing) - Browser Developer Tools usage - DOM manipulation |
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NEW QUESTION # 135
Refer to the code below:
01 let country = {
02 get capital() {
03 let city = Number( " London " );
04
05 return {
06 cityString: city.toString(),
07 }
08 }
09 }
Which value can a developer expect when referencing country.capital.cityString?
Answer: B
Explanation:
* In the getter:
* let city = Number( " London " );
The Number() constructor attempts to convert the string " London " into a numeric value.
* " London " is not a valid numeric string. When JavaScript attempts numeric conversion of a non- numeric string:
* Number( " London " ) # NaN
* Next line:
* city.toString()
When city is NaN, calling .toString() yields:
NaN.toString() # " NaN "
* The getter returns:
* {
* cityString: " NaN "
* }
* The question asks: Which value can a developer expect? The multiple-choice options include NaN , but not " NaN " .
Given the available choices, the intended correct answer is B (NaN) because the root cause is the Number( " London " ) conversion returning NaN.
JavaScript Knowledge References (text-only)
* Number(nonNumericString) returns NaN.
* NaN.toString() produces " NaN " .
* Getters compute and return their values each time the property is accessed.
NEW QUESTION # 136
01 function Monster() { this.name = ' hello ' ; };
02 const m = Monster();
What happens due to the missing new keyword?
Answer: C
Explanation:
In JavaScript, when calling a constructor function without new:
const m = Monster();
the following happens:
* The function executes as a normal function , not as a constructor.
* Inside a regular function (in non-strict mode), this refers to the global object :
* In a browser: window
* So the line:
* this.name = ' hello ' ;
becomes:
window.name = ' hello ' ;
* Since Monster() does not return anything, its return value is undefined:
* const m = undefined;
Therefore:
* m is undefined
* window.name becomes " hello "
This matches option B .
JavaScript Knowledge References (text-only)
* Calling a function without new uses the global object as this in non-strict mode.
* Constructor functions must use new to create a new object.
* Functions without an explicit return return undefined.
NEW QUESTION # 137
Refer to the code below:
01 let car1 = new promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, "Car 2
completed"));
04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, "Car 3
Completed"));
05 Promise.race([car1, car2, car3])
06 .then(value => (
07 let result = $(value) the race. `;
08 ))
09 .catch( arr => (
10 console.log("Race is cancelled.", err);
11 ));
What is the value of result when Promise.race executes?
Answer: D
NEW QUESTION # 138
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server, js file will start the server. the developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?
Answer: B
NEW QUESTION # 139
Refer to the code below:
01 let first = ' Who ' ;
02 let second = ' What ' ;
03 try {
04 try {
05 throw new Error( ' Sad trombone ' );
06 } catch (err) {
07 first = ' Why ' ;
08 throw err;
09 } finally {
10 second = ' When ' ;
11 }
12 } catch (err) {
13 second = ' Where ' ;
14 }
What are the values for first and second once the code executes?
Answer: B
Explanation:
Initial values:
* first = ' Who '
* second = ' What '
Execution:
Inner try/catch/finally:
* Line 05: throw new Error( ' Sad trombone ' );
* Control goes to the inner catch.
* Inner catch (lines 06-08):
catch (err) {
first = ' Why ' ;
throw err;
}
* first is set to ' Why ' .
* The error is rethrown.
* Inner finally (lines 09-11):
finally {
second = ' When ' ;
}
* finally runs whether or not there was an error.
* second becomes ' When ' .
After inner finally, the rethrown error continues to propagate to the outer catch.
Outer catch (lines 12-14):
} catch (err) {
second = ' Where ' ;
}
* Because the inner try rethrew, the outer catch runs.
* It sets second = ' Where ' .
Final values:
* first was changed to ' Why ' in the inner catch and never changed again.
* second became ' When ' in the inner finally, and then ' Where ' in the outer catch.
So:
* first is ' Why '
* second is ' Where '
Option B is correct.
Concepts: nested try/catch/finally, rethrowing errors, order of execution for catch vs finally, variable mutation through error propagation.
NEW QUESTION # 140
......
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