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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Type coercion and conversion rules - Truthy and falsy values - JSON parsing and usage |
| Topic 2: Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Decorators and advanced function patterns - Modules and imports/exports - Closures and execution context |
| Topic 3: Browsers and Events | 17% | - Browser APIs and Web Storage - Event handling, propagation, and delegation - Window and document object properties - Script loading and execution order - Document Object Model (DOM) manipulation |
| Topic 4: Server-Side JavaScript | 8% | - Command-line tools and scripts - Module system and require/import - Core Node.js modules - Node.js fundamentals and runtime |
| Topic 5: Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Promises and chaining - Fetch API and HTTP requests - Async/await syntax - Callbacks and callback hell |
| Topic 6: Testing | 7% | - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts |
| Topic 7: Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Error types and exception handling - Console methods and logging |
>> JavaScript-Developer-I인증시험대비자료 <<
Itexamdump는 여러분이 빠른 시일 내에Salesforce JavaScript-Developer-I인증시험을 효과적으로 터득할 수 있는 사이트입니다.Salesforce JavaScript-Developer-I인증 자격증은 일상생활에 많은 개변을 가져올 수 있는 시험입니다.Salesforce JavaScript-Developer-I인증 자격증을 소지한 자들은 당연히 없는 자들보다 연봉이 더 높을 거고 승진기회도 많아지며 IT업계에서의 발전도 무궁무진합니다.
질문 # 107
Given the following code:
let x = ( ' 15 ' + 10) * 2;
What is the value of x?
정답：B
설명：
Comprehensive and Detailed Explanation:
Evaluate step by step:
* ' 15 ' + 10
* + with a string operand performs string concatenation.
* 10 is coerced to ' 10 ' .
* Result: ' 1510 ' .
* ' 1510 ' * 2
* * always performs numeric multiplication.
* ' 1510 ' is converted to the number 1510.
* 1510 * 2 = 3020.
So x is 3020.
질문 # 108
Refer to the code:
Given the code above, which three properties are set for pet1? Choose 3 answers
정답：A,B,D
질문 # 109
Which JavaScript method can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?
정답：C
질문 # 110
Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " )
03 );
04 let car2 = new Promise(resolve = >
05 setTimeout(resolve, 1500, " Car 2 completed " )
06 );
07 let car3 = new Promise(resolve = >
08 setTimeout(resolve, 3000, " Car 3 completed " )
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value = > {
13 let result = `${value} the race.`;
14 })
15 .catch(err = > {
16 console.log( " Race is cancelled. " , err);
17 });
What is the value of result when Promise.race executes?
정답：C
설명：
Understand the three promises:
* car1:
let car1 = new Promise((_, reject) = >
setTimeout(reject, 2000, " Car 1 crashed in " )
);
* Rejects after 2000 ms (2 seconds) with message " Car 1 crashed in " .
* car2:
let car2 = new Promise(resolve = >
setTimeout(resolve, 1500, " Car 2 completed " )
);
* Resolves after 1500 ms (1.5 seconds) with message " Car 2 completed " .
* car3:
let car3 = new Promise(resolve = >
setTimeout(resolve, 3000, " Car 3 completed " )
);
* Resolves after 3000 ms (3 seconds) with message " Car 3 completed " .
Promise.race:
Promise.race([car1, car2, car3])
then(value = > {
let result = `${value} the race.`;
})
catch(err = > {
console.log( " Race is cancelled. " , err);
});
Behavior of Promise.race:
* It settles (resolves or rejects) as soon as any of the given promises settles.
* It uses the value or reason from the first settled promise.
Timing:
* car2 resolves in 1500 ms.
* car1 rejects in 2000 ms.
* car3 resolves in 3000 ms.
The first to settle is car2 at 1500 ms, with value " Car 2 completed " .
Therefore:
* Promise.race resolves (not rejects) with value = " Car 2 completed " .
* The .then handler runs; .catch is ignored because there is no rejection.
Inside .then:
let result = `${value} the race.`;
Substitute value:
let result = " Car 2 completed the race. " ;
So, result becomes:
Car 2 completed the race.
Compare to options:
* A. Car 3 completed the race.
* This would be correct if car3 were the first to resolve, which it is not (it resolves last).
* B. Car 2 completed the race.
* Exactly matches the first-resolving promise and the constructed message.
* C. Race is cancelled.
* This is the prefix of the string logged in the .catch handler, but .catch never runs because the race resolves, it does not reject first.
* D. Car 1 crashed in the race.
* car1 is the first rejection , but since a resolution from car2 happens earlier, the race is already settled successfully before car1 rejects.
Thus the correct value of result as set in the .then block is:
The answer: B
Study Guide / Concept References (no links):
* Promise.race(iterable) semantics (first settled promise wins)
* setTimeout and timing interactions with Promises
* Resolve vs reject paths and .then / .catch
* Template literals and string interpolation for building result messages
질문 # 111
Refer to the code below:
What is the output after the code executes?
정답：B
질문 # 112
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