JavaScript Error Types Quiz

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Questions and Answers

What type of error occurs when attempting to access a variable that has not been declared?

ReferenceError (correct)
RangeError
TypeError
SyntaxError

Which example illustrates a SyntaxError in JavaScript?

console.log(x);
let name = 'John'; name.pop();
const number = 5;
var a = 'missing quote; (correct)

In which scenario would a TypeError be thrown?

console.log('test' + 5);
Using undefined value in a mathematical operation
(3).toString(8);
'hello'.pop(); (correct)

When would a RangeError be likely to occur?

<p>(10).toString(100); (A)</p> Signup and view all the answers

Which statement is true regarding JavaScript errors?

<p>RangeError is associated with invalid function arguments. (A)</p> Signup and view all the answers

Flashcards

ReferenceError

Occurs when you try to use a variable that hasn't been declared.

SyntaxError

Caused by invalid JavaScript code.

TypeError

Happens when a method is called on a wrong data type.

RangeError

When a value is out of acceptable range for a function.

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Undeclared Variable

A variable used before being declared in JavaScript.

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Study Notes

JavaScript Error Types

ReferenceError: This error happens when you use a variable that hasn't been declared. For example, attempting to use username without defining it first will produce a ReferenceError.
SyntaxError: This error occurs due to incorrect JavaScript code structure. Invalid syntax, like missing operators (e.g., trying to assign a value without an assignment operator =), leads to a SyntaxError.
TypeError: This error arises when a method or function is inappropriately used on a data type that doesn't support it. An example is trying to use the .pop() method on a string, because strings do not contain arrays to pop from.
RangeError: This error is triggered when a value is outside the permissible range for a particular function or operation. For example, using base-100 as a parameter for the .toString() method is a RangeError, because the usual base is only 2 to 36.

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Description

Test your knowledge of the different types of errors in JavaScript with this quiz. We'll cover ReferenceError, SyntaxError, TypeError, and RangeError, providing examples for each. Perfect for developers looking to sharpen their understanding of error handling in JavaScript.