extra-boolean

[Boolean] data type has two possible truth values to represent logic.

📦 Node.js,
🌐 Web,
📜 Files,
📰 Docs.
📘 Wiki.

A boolean data type has two possible truth values, usually represented as
true or false. It is named after George Boole, who first defined an
algebraic system of logic in the mid 19th century [(REF)][01wiki]. Boolean
functions can be used to perform logical operations in computer programming,
such as in conditional statements, loops, and branching, to compare input values
with a set of rules to determine the output.

This is a collection of common boolean functions. It includes
the basic gates [not], [and], [or], [xor]; their complements [nand], [nor],
[xnor]; and 2 propositional logic (taught in discrete mathematics) gates
[imply], [eq]; and their complements [nimply], [neq]. There is also a
multiplexer, called [select], and a true counter, called [count]. [count]
can help you make custom gates, such as an alternate concept of xnor
which returns true only if all inputs are the same (standard [xnor] returns
true if even inputs are true). These gates can handle up to eight inputs.

The [parse] function is influenced by [(boolean)] package, and is quite good at
translating string to boolean. It can also handle double negatives, eg.
not inactive. You know the [and] of 2-inputs, but what of 1-input? What of 0?
And what of the other gates? I answer them here.

This package is available in Node.js and Web formats. To use it on the web,
simply use the extra_boolean global variable after loading with a