Assignment
Assignment is a programming-language operation that binds or stores an evaluated value in a variable, property, or other assignable location.
The Well-Grounded Rubyist, Fourth Edition
Assignment is the Ruby language operation that binds or updates an identifier with a reference to an object.
- How it is used
- Binds identifiers for later use and distinguishes rebinding a name from changing the object it references.
- How deep it goes
- Explains expression values, shared references, reassignment, scope, parse-time locals, and setter behavior, while stopping short of detailed object-storage internals.
- Examples
- Contrasts shared strings under `replace` and reassignment, and traces the same distinction through two variables referencing an array.
- What you can do after
- Diagnose/debug with it when two variables unexpectedly reflect the same mutation or stop referring to the same object.
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Get Programming: Learn to code with Python
- How it is used
- Gives calculated values reusable names and supports small conversion programs.
- How deep it goes
- Explains expression evaluation, initialization, reassignment, list-element changes, and aliasing; does not develop assignment syntax beyond these cases.
- Examples
- Works through `a = 1`, `b = 2`, and `c = a + b`, then uses indexed list replacement and conversion exercises.
- What you can do after
- Build it from scratch: initialize and update variables, calculate conversion results, and replace indexed list elements.
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F# in Action: A Revised Edition of Get Programming with F#
An assignment is an operation that binds or updates a variable with the result of an expression.
- How it is used
- Separates data transformation from storing its result, reducing mistakes across conditional branches.
- How deep it goes
- Contrasts repeated branch assignment with expression results, then demonstrates mutable and immutable state updates.
- Examples
- Uses age descriptions and a car gas-tank simulation to compare direct updates with returned states.
- What you can do after
- Apply it via F# syntax by declaring mutable state and updating it with <- when direct mutation is needed.
Read how F# in Action: A Revised Edition of Get Programming with F# explains assignment →
Learn PowerShell in a Month of Lunches: Fourth Edition, Covers Windows, Linux, and macOS
An assignment operator is a language operator that assigns a value to a variable.
- How it is used
- Uses assignment to store values for reuse in interactive PowerShell commands and scripts.
- How deep it goes
- Defines assignment, demonstrates reuse, and explains naming and lifetime, while deferring out-of-scope variables and broader scope.
- Examples
- Demonstrates assigning a server name or process ID, retrieving the value, and inspecting an assigned integer.
- What you can do after
- Apply it via PowerShell to store values and substitute them into later commands.
The Quick Python Book, Fourth Edition
- How it is used
- Creates variables, updates name-to-object references, and establishes Python's basic syntax for working with values.
- How deep it goes
- Explains syntax, naming, aliasing, deletion, tuple unpacking, swapping, and starred targets without descending into interpreter implementation.
- Examples
- Uses scalar assignment, shared lists, integer reassignment, deletion errors, parallel swapping, and starred tuple unpacking.
- What you can do after
- Apply Python assignment to create names, update references, delete bindings, swap values, and unpack sequences.
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Python Workout, Second Edition
Assignment is the Python operation that binds a value to a name or assigns it to a target.
- How it is used
- Uses assignment to capture user input and contrasts ordinary assignment with assignment expressions in loop conditions.
- How deep it goes
- Explains assignment’s expression behavior, demonstrates the walrus alternative, and stops short of broader syntax or implementation details.
- Examples
- Uses an input-reading while loop, contrasting invalid ordinary assignment with a working walrus expression.
- What you can do after
- Apply assignment expressions to combine input capture and loop testing while recognizing when ordinary assignment is invalid.
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Rust in Action: Systems programming concepts and techniques
Assignment is an operation or expression that binds or updates a variable or other assignable place with a value, potentially transferring ownership when the value is non-copyable.
- How it is used
- Uses assignment for variable binding, distinguishes it from equality testing, and tracks ownership movement between variables and functions.
- How deep it goes
- Explains syntax, unit results, compiler diagnostics, conditional misuse, and ownership transfer through concrete Rust programs.
- Examples
- Uses an invalid `if a = 10` condition, its corrected `a == 10` form, and `CubeSat` ownership transfers.
- What you can do after
- Diagnose mistaken assignment in conditions and predict ownership movement when assigning Rust values.
Read how Rust in Action: Systems programming concepts and techniques explains assignment →
Related concepts
- statementkind of · A statement is a syntactic program construct that performs an action, declaration, or control operation without necessarily producing an expression value.
- arraycontrasts with · An array is an indexed, ordered collection of elements arranged in one or more dimensions, with elements accessed by position.
- equalitycontrasts with · Equality is a programming-language relation or operation that determines whether two values are considered equal according to applicable rules.
- command-line argumentcontrasts with · A command-line argument is a value supplied to a program when it is invoked, either as positional input or as an option that configures its behavior.
- pattern matchingcontrasts with · Pattern matching is the process of comparing data or values with specified or learned patterns to identify correspondence, conformity, or a matching case.
- bindingequivalent to · Name binding is the association of an identifier with the program entity or value it denotes.
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