extra-entries

A collection of functions for operating upon Entries.
📦 Node.js, 🌐 Web, 📜 Files, 📰 Docs, 📘 Wiki.

Entries is a list of key-value pairs, with unique keys. This package includes common functions related to querying about entries, generating them, comparing one with another, finding their size, adding and removing entries, obtaining its properties, getting a part of it, getting a subset entries in it, finding an entry in it, performing functional operations, manipulating it in various ways, combining together entries or its sub-entries, of performing set operations upon it.

All functions except fromLists() take entries as 1st parameter, and expect it to be iterable. It does not need to be an array. Entries are returned by Array, Object, Set, Map.

This package is available in Node.js and Web formats. The web format is exposed as extra_entries standalone variable and can be loaded from jsDelivr CDN.

Stability: Experimental.

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

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

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

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

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

Index

Property	Description
is	Check if value is an iterable.
keys	List all keys.
values	List all values.
fromLists	Convert lists to entries.
compare	Compare two entries.
isEqual	Check if two entries are equal.
size	Find the length of an iterable.
isEmpty	Check if an iterable is empty.
get	Get value at key.
getAll	Get values at keys.
getPath	Get value at path in nested entries.
hasPath	Check if nested entries has a path.
set	Set value at key.
swap	Exchange two values.
remove	Remove value at key.
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.
head	Get first value.
tail	Get values except first.
take	Keep first n values only.
drop	Discard first n values only.
subsets	List all possible subsets.
randomKey	Pick an arbitrary key.
randomEntry	Pick an arbitrary entry.
randomSubset	Pick an arbitrary subset.
has	Check if entries has a key.
hasValue	Check if entries has a value.
hasEntry	Check if entries has an entry.
hasSubset	Check if entries 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	Finds 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 entries to given depth.
flatMap	Flatten nested entries, based on map function.
zip	Combine matching entries from all entries.
partition	Segregate values by test result.
partitionAs	Segregate entries by similarity.
chunk	Break entries into chunks of given size.
concat	Append entries from all entries, preferring last.
join	Join entries together into a string.
isDisjoint	Check if entries have no common keys.
unionKeys	Obtain keys present in any entries.
union	Obtain entries present in any entries.
intersection	Obtain entries present in both entries.
difference	Obtain entries not present in another entries.
symmetricDifference	Obtain entries not present in both entries.
randomValue	Pick an arbitrary value.