12 Questions
What type of error occurs when a programmer incorrectly predicts user behavior?
Logical Error
What is the set of rules that defines the structure of instructions in a programming language?
Syntax
What type of error occurs when a word is used out of context or is not recognizable in the language vocabulary?
Semantic Error
What is the result of a typo or unmatching parentheses in a code?
Syntax Error
What is the main difference between a syntax error and a semantic error?
Syntax errors are related to grammar, semantic errors are related to meaning
What type of error is most easily detectable by the compiler?
Syntax Error
What type of error occurs when a specific value is not of the expected type?
TypeError
What is the term for the process of finding and fixing errors?
Debugging
What type of error occurs when the programmer tries to access a function or a variable that does not exist?
ReferenceError
What is the purpose of the finally statement?
To execute code regardless of errors
What type of error is generated when a value is passed to a function outside its acceptable range?
RangeError
What is the purpose of the debugger statement?
To pause code execution
Study Notes
Errors in Programming
- Errors occur due to misconceptions, improper use of programming language, typos, or inability to predict user behavior.
- Types of errors include:
- Syntax Error: occurs when the code is ill-formed, with typos or unmatching parentheses/brackets, making it impossible for JavaScript to execute.
- Semantic Error: occurs when a new word is not recognizable in the vocabulary, or when a word is out of context, making it difficult for the compiler to detect.
- Logical Error: occurs when the code does not follow the intended direction, making it difficult to detect.
Programming Language
- Programming language communicates like natural language, with its own grammar and vocabulary.
- Grammar in programming language refers to the set of rules that define the structure of instructions.
- Vocabulary in programming language refers to the list of words that can be used to build instructions.
Syntax and Semantic Errors
- Syntax Error: violates the language syntax rule, making it impossible for the code to execute.
- Semantic Error: occurs when a word is not recognizable in the vocabulary, or when a word is out of context, making it difficult for the compiler to detect.
Error Handling
- JavaScript engine generates and throws specific objects with information about the encountered error when it detects syntactic or semantic errors.
- When errors occur, the program execution is interrupted, and the appropriate information is displayed on the console.
Exception Handling
- Exceptions are errors that occur while the program is running.
- Exceptions can be caught using try-catch blocks.
- Finally Statement is an optional block that is always executed after the try and catch blocks, regardless of whether an error occurs.
Debugging
- Debugging is a part of troubleshooting in programming.
- Debugging Statement is used to pause the program execution and wait for a decision.
- Breakpoint is a point in the code where the debugger pauses execution, allowing the developer to inspect the code.
Console Logs
- When debugging is present in a browser, the console in the developer tool shows the debugger log, indicating whether the code execution stopped, paused, or is currently in debug mode.
Test your understanding of common programming errors, including syntax, semantic, and logical errors. Also, learn about the basics of programming languages, including syntax and vocabulary.
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