tomprogers

// before running this, define ITEMS as an array of objects whose props you wish to examine

items.reduce((tallies, asset) => {
	Object
	.keys(asset)
	.forEach((prop) => {
		
		if(tallies.hasOwnProperty(`${prop} (${typeof asset[prop]})`)) {
			console.log(`has ${prop} (${typeof asset[prop]})`);
			tallies[`${prop} (${typeof asset[prop]})`] += 1;

tomprogers

// somewhere, you had to set this up
const LVDS = new ListView.DataSource({
	getSectionHeaderData: (blob, sectionId) => blob.sectionData[sectionId],
	getRowData: (blob, sectionId, rowId) => blob.rowData[rowId]
});

// ... and then you had to feed data into it with this:
let newListData = LVDS.cloneWithRowsAndSections(blob, sectionIds, rowIdsBySection)

// but what do blob, sectionIds, and rowIdsBySection look like, and how are they used internally by ListView?

tomprogers

// NOTE: I'm using a few ES6 features, like Arrow Functions and default argument values
// Hopefully they don't trip you up while reading this.

import React, { Component, ListView } from 'react-native';

import Moment from 'moment'; // only needed for my example

// I reuse this configuration everywhere. As a rule, each component creates just one of them,
// and since changing the dataset doesn't require mutating this object, I define it as a const.
//