Debugging:
- Debugging is the process of finding and resolving errors or bugs in software code, scripts, or programs. It involves identifying and analyzing the root cause of a problem, diagnosing the issue, and fixing it so that the software performs as expected.
Some Debug Methods:
- Using the console command
- Setting the breakpoint
- Using the debugger Keyword
- Backtracking
Common Types of Errors:
There are several types of errors that can occur in JavaScript:
- Syntax errors
- Runtime errors
- Logical errors
- Type errors
- Reference errors
- Range errors
- Network errors
- What type of error is commonly caused by referencing a variable or function that has not been defined?
- ReferenceError
- What type of error is commonly caused by trying to perform an operation on a value that is not of the expected type?
- TypeError
- What type of error is commonly caused by trying to access an array element that does not exist?
- TypeError
- What type of error is commonly caused by trying to call a function that does not exist?
- ReferenceError
- What type of error will the following code throw?
const num = 10; num();
- TypeError
- What type of error will the following code snippet produce?
let x = 10; x = y + 5; console.log(x);
- ReferenceError
- What type of error will the following code snippet produce?
const obj = { name: 'John' }; Object.keys(obj).forEach(prop => console.log(prop));
- None of the above
- What type of error will the following code snippet produce?
const name = 'John'; name.toUpperCase = () => 'JOHN'; console.log(name.toUpperCase());
- None of the above
- What type of error will the following code snippet produce?
const arr = [1, 2, 3]; arr.slice(-2, 0);
- RangeError
- What type of error will the following code snippet produce?
const greeting = 'Hello, world!';
- None of the above