JavaScript-Developer-I考試備考經驗|通過保證|退款保證

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Variables, Types, and Collections23%- Type coercion and conversion
- Strings, numbers, and dates
- JSON parsing and manipulation
- Primitive and complex data types
- Truthy and falsy evaluations
- Variable declarations and initialization
- Arrays and collections
Testing7%- Writing and modifying unit tests
- Unit testing concepts
- Test effectiveness evaluation
- Test coverage and reliability
Server Side JavaScript8%- Server-side JavaScript implementations
- Package management (npm)
- CLI commands
- Node.js fundamentals
- Core Node.js modules
Debugging and Error Handling7%- Error handling techniques (try/catch/finally)
- Breakpoints and code inspection
- Custom error types
- Console methods for debugging
Asynchronous Programming13%- Event loop and execution flow
- Asynchronous patterns for business requirements
- Promises (creation, chaining, error handling)
- Callbacks
- Async/Await syntax
Browser and Events17%- Event handling and listeners
- Browser Developer Tools usage
- Interacting with forms and user input
- Browser-specific APIs
- DOM manipulation
- Event propagation (bubbling and capturing)
Objects, Functions, and Classes25%- Higher-order functions
- Object creation and manipulation
- Arrow functions
- Variable scope and closures
- Modules and decorators
- Prototypal inheritance
- Execution flow and context
- ES6 classes and inheritance
- Function declarations and expressions

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最新的 Salesforce Developer JavaScript-Developer-I 免費考試真題 (Q140-Q145):

問題 #140
for (let number = 2; number < = 5; number += 1) {
// faster code statement here
}
Which statement meets the requirements to log an error when the Boolean statement evaluates to false?

答案：B

解題說明：
* console.assert(condition, message?) logs an assertion error if condition is falsy.
* To log an error when number + 2 === 0 is false, use:
console.assert(number + 2 === 0);
Other options are invalid or do not behave as described: console.error always logs, assert alone is not a built- in browser global, and console.classy doesn't exist.


問題 #141
Which function should a developer use to repeatedly execute code at a fixed interval ?

答案：A


問題 #142
A developer has a server running with Node.js. the command to start the web server is node server.js. the server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

答案：C


問題 #143
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?

答案：A,D


問題 #144
A developer needs to test this functions:

Which two assert statements are valid tests for this function?

答案：A,D


問題 #145
......

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