Optimized Object List

Utility functions for converting javascript objects to and from a list of values. This is used to optimize the datasize required for sending many objects when other compression methods are not available.

Usage

Convert from object array to optimized object list:

import { objectListToOptimizedList } from '@trt2/optimized-objectlist';

const objArray = [
    { "id": 1, "firstName": "John", "lastName": "Doe", "isActive": false },
    { "id": 2, "firstName": "Jane", "lastName": "Doe", "isActive": true }
] 

const res = objectListToOptimizedList({
    data: objArray,
    columns: {
            id: "id",       // map key "id" to column "id" in output
            firstName: "firstName",
            lastName: "lastName",
            isActive: "isActive"
        }
    });

/* 
    res = {
        "columns": [ "id", "firstName", "lastName", "isActive" ],
        "data": [ [ 1, "John", "Doe", false ], [ 2, "Jane", "Doe", true ] ]
    }
*/   

Convert from optimized object list to object list:

import { optimizedListToObjectList } from '@trt2/optimized-objectlist';

const optObjList = {
    "columns": [ "id", "firstName", "lastName", "isActive" ],
    "data": [ [ 1, "John", "Doe", false ], [ 2, "Jane", "Doe", true ] ]
}

const res = optimizedListToObjectList(optObjList);

/*
    res = [
        { "id": 1, "firstName": "John", "lastName": "Doe", "isActive": false },
        { "id": 2, "firstName": "Jane", "lastName": "Doe", "isActive": true }
    ]  
*/

Function Parameters

function optimizedListToObjectList(dataObj, columnKey, dataKey)

• dataObj - Optimized object to process
• columnKey - Name of key in dataObj containing array of columns (default: 'columns')
• dataKey - Name of key in dataObj containing data (default: 'data')

function objectListToOptimizedList({data, columns, columnKey, dataKey} = {})

• data - List of objects to convert to optimized object list
• columns - Object where keys are the keys in objects to optimize and the value is the name the column will be given in the output
• columnKey - The object key containing the column array (default: 'columns')
• dataKey - The object key containing the optimized object data (default: 'data')