Online Access Free JavaScript-Developer-I Practice Test

Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?

• A.let strValue = String(numValue);
• B.let strValue = numValue.toString();
• C.let strValue = ' ' + numValue;
• D.let strValue = (String)numValue;
• E.let strValue = numValue.toText();

Given the JavaScript below:
function onLoad() {
console.log( " Page has loaded! " );
}
Where can the developer see the log statement after loading the page in the browser?

• A.On the browser JavaScript console
• B.On the webpage console log
• C.On the terminal console running the web server
• D.In the browser performance tools log

Which two code snippets show working examples of a recursive function?

• A.const factorial = numVar = > {
  if (numVar < 0) return;
  if (numVar === 0) return 1;
  return numVar * factorial(numVar - 1);
  };
• B.const sumToTen = numVar = > {
  if (numVar < 0)
  return;
  return sumToTen(numVar + 1);
  };
• C.let countingDown = function(startNumber) {
  if (startNumber > 0) {
  console.log(startNumber);
  return countingDown(startNumber - 1);
  } else {
  return startNumber;
  }
  };
  (Note: Option D is shown here with corrected syntax: lowercase return and matching parentheses.)
• D.function factorial(numVar) {
  if (numVar < 0) return;
  if (numVar === 0) return 1;
  return numVar - 1;
  }

Given the code below:
01 setCurrentUrl();
02 console.log( " The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?

• A.The url variable has global scope and line 02 executes correctly.
• B.The url variable has local scope and line 02 throws an error.
• C.The url variable has global scope and line 02 throws an error.
• D.The url variable has local scope and line 02 executes correctly.

Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?

• A.[ " foo " , " bar " ]
• B.An error will occur due to the incorrect usage of the for_of statement on line 07.
• C.[ " foo:1 " , " bar:2 " ]
• D.[1, 2]