lazy-aggregator

Create lazy-initialized dictionary based on source dictionary handled with fn

Parameters

• source Object<string, any> dictionary of configs for fn call (optional, default {})
• fn function function which will be used to create elements in aggregation (optional, default function(key,value){returnvalue})

Examples

import Aggregation from 'lazy-aggregator';
const fn = (a) => a * 2;
const source = { el1: 1, el2: 2};

const aggregation = new Aggregation(source, fn);
aggregation['el1']; // 1
aggregation.el2; // 2

• Throws Error if fn is not a function

add

add element to aggregation

Parameters

• key String first argument to fn
• value any? data for fn call

Examples

import Aggregation from 'lazy-aggregator';
import {add} from 'lazy-aggregator';
const fn = (a) => a * 2;
const source = { el1: 1, el2: 2};
const aggregation = new Aggregation({}, fn);
aggregation[add]('newEl', 2);
aggregation.newEl; // 4

Returns Object this

del

delete element from aggregation

Parameters

• key String key of aggregation member to delete

Examples

import Aggregation from 'lazy-aggregator';
import {del} from 'lazy-aggregator';
const fn = (a) => a * 2;
const aggregation = new Aggregation({newEl: 3}, fn);
aggregation[del]('newEl');
aggregation.newEl; // undefined

Returns Object this

Installation

npm install --save lazy-aggregator