David Nguyen
Knowledge check: Error handling in Javascript

Knowledge check: Error handling in Javascript

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David Nguyen
·

1 min read

  1. What will be printed when the following code runs?

     var result = null;
 console.log(result);

    • undefined

    • null

    • 0

  2. When the following code runs, what will print out?

     try {
   console.log('Hello');
 } catch(err) {
   console.log('Goodbye');
 }

    • Hello

    • Goodbye

  3. If you pass an unsupported data type to a function, what error will be thrown?

    • RangeError

    • SyntaxErrror

    • TypeError

  4. What will print out when the following code runs?

     var x;

 if(x === null) {
   console.log("null");
 } else if(x === undefined) {
   console.log("undefined");
 } else {
   console.log("ok");
 }

    • null

    • undefined

    • ok

  5. What will print out when the following code runs?

     throw new Error();
 console.log("Hello");

    • Hello

    • Nothing will print out.