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Questions and Answers
What type of error occurs when a programmer incorrectly predicts user behavior?
What type of error occurs when a programmer incorrectly predicts user behavior?
What is the set of rules that defines the structure of instructions in a programming language?
What is the set of rules that defines the structure of instructions in a programming language?
What type of error occurs when a word is used out of context or is not recognizable in the language vocabulary?
What type of error occurs when a word is used out of context or is not recognizable in the language vocabulary?
What is the result of a typo or unmatching parentheses in a code?
What is the result of a typo or unmatching parentheses in a code?
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What is the main difference between a syntax error and a semantic error?
What is the main difference between a syntax error and a semantic error?
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What type of error is most easily detectable by the compiler?
What type of error is most easily detectable by the compiler?
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What type of error occurs when a specific value is not of the expected type?
What type of error occurs when a specific value is not of the expected type?
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What is the term for the process of finding and fixing errors?
What is the term for the process of finding and fixing errors?
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What type of error occurs when the programmer tries to access a function or a variable that does not exist?
What type of error occurs when the programmer tries to access a function or a variable that does not exist?
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What is the purpose of the finally statement?
What is the purpose of the finally statement?
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What type of error is generated when a value is passed to a function outside its acceptable range?
What type of error is generated when a value is passed to a function outside its acceptable range?
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What is the purpose of the debugger statement?
What is the purpose of the debugger statement?
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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.
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Description
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.
