@teamawesome/multi-dict

Installation

npm install @teamawesome/multi-dict

Usage

The aim of multi-dict is to behave just like a set of nested maps, but with an easy to use api. It supports all the regular methods of Map, including the iterators.

import Dictionary from '@teamawesome/multi-dict'

const dict = new Dictionary();

Parameters

• entries Optional. An iterable whose elements are in the shape of [key1, ..., value]. Each element is added to the dict.
• options Optional. A hash of options as specified in the options paragraph.

new Dictionary([ /* Entries */ ], { /* Options */ });
new Dictionary([ /* Entries */ ]);

Options

By default, each level of the dict is a Map. However, you can specify a type for each level and/or a default type.

• defaultType The constructor for each level not specified in types. Default is Map.
• types Array of constructors, for each depth that should be specified.

// Each level of the dict will be an array
new MultiDict({
  defaultType: Array
});

// The first level will be an Object, the second an Array.
// The third and deeper levels will be the default type.
new MultiDict({
  types: [Object, Array]
});

Methods

• get(...keys) Get a value by its path
• set(...keys, value) Set a value by a path of keys
• has(...keys) Check if a path of keys exists
• delete(...keys) Delete a path of keys
• clear() Remove all entries in the dict
• level(...keys) Get a new Dictionary from the given level
• forEach(callback, thisArg) Run a callback for each entry of the dict

dict.set(key1, key2, value);
dict.get(key1, key2); // => value

dict.set(key1, key2, key3, value);
dict.get(key1, key2, key3); // => value
dict.has(key1, key2, key3); // => true

// Only values that have been set before can be retrieved.
dict.has(key1, key2); // false!
dict.get(key1, key2); // => undefined!

dict = new Dictionary([
  ['a', 'b', 'value',]
  ['a', 'b', 'c1', 'value c1']
  ['a', 'b', 'c2', 'value c2']
]);

dict2 = dict.level('a', 'b');
[...dict2.entries()] // => [[[], 'value'], [['c1'], 'value c1'], [['c2'], 'value c2']]

Iterable methods:

• keys Get an iterable yielding all the paths of the dict
• values Get an iterable yielding all the values of the dict
• entries Get an iterable yielding all the paths and values of the dict
• Symbol.iterator Get an iterable yielding all the paths and values of the dict

for (const keys of dict.keys())
for (const value of dict.values())
for (const [keys, value] of dict.values())
for (const [keys, value] of dict)

Properties

• size The amount of entries in the dictionary