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Salesforce Certified JavaScript Developer I Sample Questions (Q154-Q159):
NEW QUESTION # 154
A developer wants to create an object from a function in the browser using the code below.
What happens due to the lack of the mm keyword on line 02?
- A. window.m Is assigned the correct object.
- B. The m variable is assigned the correct object but this.name remains undefined.
- C. The m variable is assigned the correct object.
- D. window.name is assigned to 'hello' and the variable = remains undefined.
Answer: D
NEW QUESTION # 155
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?
- A. try{
ws.connect (( ) => {
console.log('connected to client'); }); - B. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
}); - C. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }}; - D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
Answer: D
Explanation:
} catch(error) { console.log('ERROR' , error); };
}
NEW QUESTION # 156
bar, awesome is a popular JavaScript module. the versions publish to npm are:
Teams at Universal Containers use this module in a number of projects. A particular project has the package, json definition below.
A developer runs this command: npm install.
Which version of bar .awesome is installed?
- A. 1.4.0
- B. The command fails, because version 130 is not found
- C. 1.3.1
- D. 1.3.5
Answer: D
NEW QUESTION # 157
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Goodbye and salutation is I say Hello.
- B. Greeting is Hello and salutation is Hello, Hello.
- C. Greeting is Goodbye and salutation is Hello, Hello.
- D. Greeting is Hello and salutation is I say hello.
Answer: B
NEW QUESTION # 158
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
- A. [1, 2, 3, 4, 5, 4, 4]
- B. [1, 2, 3, 5]
- C. [1, 2, 3, 4, 5, 4]
- D. [1, 2, 3, 4, 4, 5, 4]
Answer: D
NEW QUESTION # 159
......
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