Name-value pair
A name-value pair is a data association in which an identifying name or key corresponds to a value.
Python Workout: 50 ten-minute exercises
- How it is used
- Uses name-value pairs to organize records, related data, configuration, lookups, and accumulated results in Python dictionaries.
- How deep it goes
- Explains keys, values, dictionary lookup, and hashing, but defers detailed implementation changes and internals.
- Examples
- Demonstrates menus, word-count dictionaries, configuration files, city populations, and transformed name-hobby data.
- What you can do after
- Apply it via Python dictionaries and comprehensions to store, retrieve, transform, and accumulate associated data.
Read how Python Workout: 50 ten-minute exercises explains name-value pair →
Python Workout, Second Edition
A key-value pair is a two-part dictionary entry consisting of a key and its associated value.
- How it is used
- Uses name–value pairs to model records, configuration, accumulated data, function options, and transformed collections.
- How deep it goes
- Explains dictionary storage, lookup, uniqueness, hashing, and comprehensions, while deferring detailed Python 3.6 implementation changes.
- Examples
- Uses configuration files, city rainfall totals, XML attributes, and city-population transformations as concrete pair-based exercises.
- What you can do after
- Apply via Python dictionaries, dict.get, **kwargs, and dictionary comprehensions to create, update, and transform associations.
Read how Python Workout, Second Edition explains name-value pair →
The Well-Grounded Rubyist, Fourth Edition
A key/value pair, or hash entry, consists of a key and its associated value stored in a hash.
- How it is used
- Organizes named data for direct lookup, iteration, filtering, and transformation within Ruby hashes.
- How deep it goes
- Explains creation, retrieval, uniqueness, insertion order, iteration representation, filtering, inversion, and mutation edge cases.
- Examples
- Uses state abbreviations, indexed gemstone pairs, Boolean hash queries, nested contacts, and filtering or inversion examples.
- What you can do after
- Apply Ruby hash syntax to store, retrieve, iterate, filter, replace, and transform named data.
Read how The Well-Grounded Rubyist, Fourth Edition explains name-value pair →
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
A JSON key-value pair associates a quoted property name with a JSON value using a colon separator.
- How it is used
- Represents structured application data for storage, transmission, and REST API communication.
- How deep it goes
- Defines pair syntax, permitted values, nesting, ordering, whitespace, and common invalid forms without requiring full RFC detail.
- Examples
- Uses interface data, nested device configuration, and malformed objects to test pair interpretation and punctuation.
- What you can do after
- Evaluate JSON objects, identify each name-value association, and diagnose missing, misplaced, or invalid separators.
Read how Acing the CCNA Exam: Volume 2 Advanced Networking and Security explains name-value pair →
Building Web APIs with ASP.NET Core
A key/value pair is a data representation that associates a named key with its corresponding value.
- How it is used
- Uses name–value pairs to model flexible NoSQL documents and attach custom metadata to generated API schemas.
- How deep it goes
- Explains the representation and implements reusable attributes plus schema filtering, stopping short of database query mechanics.
- Examples
- Demonstrates repeated x-test extensions on UserName and a custom extension on a board-game endpoint parameter.
- What you can do after
- Build custom OpenAPI metadata by defining repeatable attributes and registering a schema filter with SwaggerGen.
Read how Building Web APIs with ASP.NET Core explains name-value pair →
Get Programming: Learn to code with Python
- How it is used
- Maps one object to another so a key can be used to look up its associated value.
- How deep it goes
- Defines keys and values, then demonstrates creating, adding, replacing, and removing dictionary entries.
- Examples
- Uses grocery quantities, animal leg counts, and household contents as dictionary entries.
- What you can do after
- Operate Python dictionaries by adding, replacing, and removing key-value pairs.
Read how Get Programming: Learn to code with Python explains name-value pair →
Object-Oriented Software Design in C++
- How it is used
- Uses associations to represent variable book attributes and support flexible catalogue searches.
- How deep it goes
- Explains map key and value typing, then implements heterogeneous values with variant and pair matching.
- Examples
- Demonstrates book attribute maps, typed keys, catalogue queries, and matching results for fiction and regional cookbooks.
- What you can do after
- Build flexible C++ attribute storage and search using map, enum class, and variant.
Read how Object-Oriented Software Design in C++ explains name-value pair →
Everyday Data Visualization
A key-value pair is a named data association in which a key identifies and a value supplies the associated data.
- How it is used
- Organizes nested data and supplies compact inputs for visualizations such as one-bar-per-fruit charts.
- How deep it goes
- Defines syntax, key and value types, nesting, and alternative organizations, but does not detail programmatic generation.
- Examples
- Uses weekday schedules, fruit taste scores, indexed fruit records, and a titled nested fruit dataset.
- What you can do after
- Apply via JSON by structuring named values, nesting related records, and preparing simple visualization data.
Read how Everyday Data Visualization explains name-value pair →
Rust in Action: Systems programming concepts and techniques
A key-value pair collection is an abstract data structure that associates each key with a corresponding value.
- How it is used
- Uses key-value collections for lookup, ordered selection, and durable file records.
- How deep it goes
- Explains terminology, hashing, lookup behavior, implementation choice, ordered iteration, range queries, and serialized record parsing.
- Examples
- Demonstrates VOC investment mappings, ordered output, range queries, hash calculation, and Bitcask record parsing.
- What you can do after
- Apply it via Rust HashMap or BTreeMap, choosing lookup or ordering behavior and interpreting serialized records.
Read how Rust in Action: Systems programming concepts and techniques explains name-value pair →
MongoDB 8.0 in Action, Third Edition
A key-value pair is an association between a named key and the value stored under that key.
- How it is used
- Organizes MongoDB document data so applications can represent, query, update, and retrieve structured information.
- How deep it goes
- Defines field-value associations and demonstrates simple, array, and nested values, without descending into BSON encoding internals.
- Examples
- Uses book documents and a student academic record containing identifiers, scalar fields, arrays, and nested assessment objects.
- What you can do after
- Apply name-value pairs when reading MongoDB documents and forming queries, updates, and deletions by field values.
Read how MongoDB 8.0 in Action, Third Edition explains name-value pair →
Grokking Concurrency
A key-value pair is a data representation consisting of a key associated with a corresponding value.
- How it is used
- Uses pairs to represent intermediate word-count results between map and reduce phases.
- How deep it goes
- Defines keys and values, demonstrates aggregation, and stops short of broader data-structure implementation details.
- Examples
- Uses word-count outputs such as ("the", 1), repeated keys, and the aggregated result ("the", 2).
- What you can do after
- Build it from scratch by emitting word-count pairs and aggregating values for each unique word.
Related concepts
- Mappart of · A map is an associative data structure that stores key-value pairs and supports retrieving values by key.
- JSON objectpart of · A JSON object is an unordered collection of members, each consisting of a string name paired with a JSON value and represented within curly braces.
- hash mappart of · A hash map is a key-value data structure that uses a hash function to locate entries and support efficient lookup, insertion, and removal by key.
- output formatused by · An output format is a specified structure or representation in which a result is returned or produced.
- items methodproduced by · The Python dictionary items() method returns a dynamic view of the dictionary’s key-value pairs.
- JSONpart of · JSON is a standardized, language-independent text format for representing structured data using objects, arrays, strings, numbers, Boolean values, and null.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.