Online Access Free JavaScript-Developer-I Practice Test

What is the result of the code block?

• A.The console logs 'flag' and then an error is thrown.
• B.The console logs 'flag' and another flag.
• C.The console logs only 'flag'.
• D.An error is thrown.

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.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?

• A.Replace line 03 with if(arr.length == 0 ) ( return 0; )
• B.Replace line02 with return arr.map(( result, current) => (
• C.Replace line 05 with return result;
• D.Replace line 04 with result = result +current;

Refer tothe code below:

What is the value of result after line 10 executes?

• A.John Developer
• B.John undefined
• C.Error: myFather.job is not a function
• D.undefined Developer

Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

• A.Undefined
• B.'Null value!'
• C.'Undefined values!'
• D.Line 13 throws an error.

A developer has an ErrorHandler module that contains multiple functions.
What kind of export be leverages so that multiple functions can beused?

• A.Multi
• B.All
• C.Named
• D.Default