Extra-ilists NPM

ILists is a pair of key iterable list and value iterable list, with unique keys. 📦 Node.js, 🌐 Web, 📜 Files, 📰 Docs, 📘 Wiki.

As mentioned above, ILists is a data structure that consists of a pair of iterable lists, one for keys and one for values. The keys are unique, meaning there are no duplicate entries. ILists is an iterable version of Lists. Use it when you don't have the keys and values as Arrays.

This package includes functions that allow you to query about, generate, compare, and manipulate the data within the ILists. You can find out its size, add and remove entries, obtain its properties, get parts or subsets of the data, find specific entries within it, perform functional operations, combine ILists or its sub-entries, or perform set operations upon it. Except fromEntries(), all functions take ILists as their first parameter.

This package is available in Node.js and Web formats. To use it on the web, simply use the extra_ilists global variable after loading with a <script> tag from the jsDelivr CDN.

Stability: Experimental.

const xilists = require('extra-ilists');
// import * as xilists from 'extra-ilists';
// import * as xilists from 'https://unpkg.com/extra-ilists/index.mjs'; (deno)

var x = [['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4, 5]];
xilists.filter(x, v => v % 2 === 1);
// → [ [ 'a', 'c', 'e' ], [ 1, 3, 5 ] ]

var x = [['a', 'b', 'c', 'd'], [1, 2, -3, -4]];
xilists.some(x, v => v > 10);
// → false

var x = [['a', 'b', 'c', 'd'], [1, 2, -3, -4]];
xilists.min(x);
// → -4

var x = [['a', 'b', 'c'], [1, 2, 3]];
[...xilists.subsets(x)].map(a => [[...a[0]], [...a[1]]]);
// → [
// →   [ [], [] ],
// →   [ [ 'a' ], [ 1 ] ],
// →   [ [ 'b' ], [ 2 ] ],
// →   [ [ 'a', 'b' ], [ 1, 2 ] ],
// →   [ [ 'c' ], [ 3 ] ],
// →   [ [ 'a', 'c' ], [ 1, 3 ] ],
// →   [ [ 'b', 'c' ], [ 2, 3 ] ],
// →   [ [ 'a', 'b', 'c' ], [ 1, 2, 3 ] ]
// → ]

Index

Property	Description
is	Check if value is ilists.
keys	List all keys.
values	List all values.
entries	List all key-value pairs.

fromEntries	Convert ilists to entries.

size	Find the size of ilists.
isEmpty	Check if ilists is empty.

compare	Compare two ilists.
isEqual	Check if two ilists are equal.

get	Get value at key.
getAll	Gets values at keys.
getPath	Get value at path in nested ilists.
hasPath	Check if nested ilists has a path.
set	Set value at key.
swap	Exchange two values.
remove	Remove value at key.

head	Get first entry from ilists (default order).
tail	Get ilists without its first entry (default order).
take	Keep first n entries only (default order).
drop	Remove first n entries (default order).

count	Count values which satisfy a test.
countAs	Count occurrences of values.
min	Find smallest value.
minEntry	Find smallest entry.
max	Find largest value.
maxEntry	Find largest entry.
range	Find smallest and largest values.
rangeEntries	Find smallest and largest entries.

subsets	List all possible subsets.
randomKey	Pick an arbitrary key.
randomValue	Pick an arbitrary value.
randomEntry	Pick an arbitrary entry.
randomSubset	Pick an arbitrary subset.

has	Check if ilists has a key.
hasValue	Check if ilists has a value.
hasEntry	Check if ilists has an entry.
hasSubset	Check if ilists has a subset.
find	Find first value passing a test (default order).
findAll	Find values passing a test.
search	Finds key of an entry passing a test.
searchAll	Find keys of entries passing a test.
searchValue	Find a key with given value.
searchValueAll	Find keys with given value.

forEach	Call a function for each value.
some	Check if any value satisfies a test.
every	Check if all values satisfy a test.
map	Transform values of entries.
reduce	Reduce values of entries to a single value.
filter	Keep entries which pass a test.
filterAt	Keep entries with given keys.
reject	Discard entries which pass a test.
rejectAt	Discard entries with given keys.
flat	Flatten nested ilists to given depth.
flatMap	Flatten nested ilists, based on map function.
zip	Combine matching entries from all ilists.

partition	Segregate values by test result.
partitionAs	Segregate entries by similarity.
chunk	Break ilists into chunks of given size.

concat	Append entries from all ilists, preferring last.
join	Join ilists together into a string.

isDisjoint	Check if ilists have no common keys.
unionKeys	Obtain keys present in any ilists.
union	Obtain entries present in any ilists.
intersection	Obtain entries present in both ilists.
difference	Obtain entries not present in another ilists.
symmetricDifference	Obtain entries not present in both ilists.