Difference between revisions of "Key-value pair"
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===Key Pair is a special kind of key-value pair=== | ===Key Pair is a special kind of key-value pair=== | ||
The term [[key pair]] has special meaning in the context of cryptography. The key in [[key pair]] is the special data piece, whether it is a file, a string, or any other piece of data, that gets mapped onto another value, usually a specifically formatted string, so that if the key is slightly changed, the value of [[key pair]] will almost always change. See the following video<ref>{{:Video/Key Pair - ETH.BUILD}}</ref> to learn about [[key pair]]. | The term [[key pair]] has special meaning in the context of cryptography. The key in [[key pair]] is the special data piece, whether it is a file, a string, or any other piece of data, that gets mapped onto another value, usually a specifically formatted string, so that if the key is slightly changed, the value of [[key pair]] will almost always change. See the following video: [[Video/Key Pair - ETH.BUILD|Key Pair - ETH.BUILD]]<ref>{{:Video/Key Pair - ETH.BUILD}}</ref> to learn about [[key pair]]. | ||
Revision as of 16:08, 22 May 2022
Key-value pair is a fundamental data type, which only specifies a relationship between a name or key with a value. It can be thought of as a kind of hashtable or dictionary data type, and can be used to implement S-expressions. The ultimate meta language Backus-Naur form is basically a collection of key-value pairs.
A collection of key-value pairs can also be considered as a lookup table or a dictionary data type.
It is known that ordered pairs of data was used to construct matrix algebra[1].
Industry Examples of Nested Key-value pairs
The yaml, Yet Another Markup Language, is a typical realization of denoting key-value pairs in a highly popular language in the world of Infrastructure as code. JSON, the JavaScript Serial Object Notation, is another kind of nested key-value pairs. JSON's expressiveness is basically equivalent to YAML.
Backus-Naur Form
Backus-Naur Form(Q211577), often abbreviated as BNF, is one of the two main notation techniques for context-free grammars in computer science.
BNF is a formal language that can be denoted in a collection of key-value pairs. For instance:
<symbol> ::= __expression__
In the example shown above, <symbol>
denotes a key, and __expression__
denotes a value.
<symbol>
is a nonterminal (variable) and the__expression__
consists of one or more sequences of either terminal or nonterminal symbols;=::=
means that the symbol on the left must be replaced with the expression on the right.- more sequences of symbols are separated by the vertical bar "|", indicating an alternation choice, the whole being a possible substitution for the symbol on the left.
Symbols that never appear on a left side are terminals. On the other hand, symbols that appear on a left side are non-terminals and are always enclosed between the pair <>
.
Associative Array
Associative array is a kind of table, like Table in Lua, which is stored as a set of key-value pairs.
Key Pair is a special kind of key-value pair
The term key pair has special meaning in the context of cryptography. The key in key pair is the special data piece, whether it is a file, a string, or any other piece of data, that gets mapped onto another value, usually a specifically formatted string, so that if the key is slightly changed, the value of key pair will almost always change. See the following video: Key Pair - ETH.BUILD[2] to learn about key pair.
References
- ↑ Vysotskaya, Anna (July 24, 2018). "Accounting Games: Using Matrix Algebra in Creating the Accounting Models". local page: Mathematics.
- ↑ Griffith, Austin (Oct 26, 2019). Key Pair - ETH.BUILD. local page: Austin Griffith.