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. |