Keyword
A keyword is a language-defined word or token with a predefined syntactic or semantic role, often restricted from use as an ordinary identifier.
The Well-Grounded Rubyist, Fourth Edition
A Ruby keyword is a predefined reserved term associated with a specific programming construct or syntactic context, including the logical-negation keyword not.
- How it is used
- Distinguishes reserved syntax from local variables and method calls when reading Ruby identifiers.
- How deep it goes
- Explains reserved words and the order of bareword resolution, without cataloging every keyword.
- Examples
- Uses `def`, `if`, `class`, `true`, `false`, and an unresolved bare `x` to distinguish syntactic roles.
- What you can do after
- Diagnose/debug ambiguous Ruby barewords by checking for a keyword, assignment, parentheses, or an existing definition.
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Get Programming: Learn to code with Python
A keyword is a reserved word in a programming language with a predefined syntactic meaning.
- How it is used
- Uses reserved words to mark Python syntax for decisions, classes, and condition-controlled loops.
- How deep it goes
- Defines reserved words and demonstrates three uses, but does not provide a complete keyword inventory or language-level implementation details.
- Examples
- Demonstrates if with a positive-number check, class with Circle, and while with a word-guessing game.
- What you can do after
- Evaluate Python code by recognizing reserved words and relating each keyword to the structure it begins.
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Java Persistence with Spring Data and Hibernate epub
An SQL keyword that has a predefined syntactic or semantic meaning and therefore may be invalid as an unquoted identifier.
- How it is used
- Prevents SQL naming collisions when JPA maps entity or property names to database identifiers.
- How deep it goes
- Explains explicit renaming, automatic quoting, manual quoting, and dialect limitations without detailing SQL parser internals.
- Examples
- Uses User mapped to USERS and contrasts automatic, backtick, and double-quote identifier handling.
- What you can do after
- Operate/configure JPA mappings that avoid or deliberately quote reserved database names.
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Related concepts
- MySQLused by · MySQL is an open-source relational database management system that stores, manages, and queries structured data using SQL.
- SQLuses · SQL is a standardized declarative language for defining, querying, and manipulating data and structures in relational database systems.
- programming languagepart of · A programming language is a formal language with defined syntax and semantics for expressing computations and instructions that computers can execute or interpret.
- break statementincludes · A break statement terminates the nearest supported enclosing loop, switch, or similar control construct and transfers control to the following statement.
- context keywordincludes · A Given step is a Gherkin scenario step that establishes the initial context, provider state, or prerequisites for an example.
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