A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.

01 const sumFunction = arr = > {

02 return arr.reduce((result, current) = > {

03 //

04 result += current;

05 //

06 }, 10);

07 };

Which line replacement makes the code work as expected?

A. 03 if(arr.length == 0) { return 0; }

B. 04 result = result + current;

C. 02 arr.map((result, current) = > {

D. 05 return result;

Given two expressions, exp1 and exp2, which two valid ways return the logical AND of the two expressions and ensure it is a Boolean?

A. Boolean(exp1 & & exp2)

B. Boolean(exp1) & & Boolean(exp2)

C. exp1 & exp2

D. Boolean(var1) & & Boolean(var2)

A developer publishes a new version of a package with bug fixes but no breaking changes. The old version number was 2.1.1.

What should the new package version number be based on semantic versioning?

A. 2.1.2

B. 2.2.0

C. 2.2.1

D. 3.1.1

A Node.js server library uses events and callbacks. The developer wants to log any issues the server has at boot time.

Which code logs an error with an event?

A. server.catch( ' error) = > {
console.log( ' ERROR ' , error);
});

B. server.error( ' error) = > {
console.log( ' ERROR ' , error);
});

C. server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
});

D. try {
server.start();
} catch(error) {
console.log( ' ERROR ' , error);
}

Given the HTML below:

< div >

< div id= " row-uc " > Universal Containers < /div >

< div id= " row-as " > Applied Shipping < /div >

< div id= " row-bt " > Burlington Textiles < /div >

< /div >

Which statement adds the priority-account CSS class to the Applied Shipping row?

A. document.querySelectorAll( ' #row-as ' ).classList.add( ' priority-account ' );

B. document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' );

C. document.querySelector( ' #row-as ' ).classes.push( ' priority-account ' );

D. document.getElementById( ' row-as ' ).addClass( ' priority-account ' );