ArrowWriter

The ArrowWriter encodes a set of arrays into an ArrayBuffer of Apach Arrow columnar format.

Loader	Characteristic
File Format	Arrow
Data Format	Arrow Columnar Format
File Extensions	.arrow, .feather
File Type	Binary
Support API	encodeSync

Usage

import {encodeSync} from '@loaders.gl/core';
import {ArrowWriter, VECTOR_TYPES} from '@loaders.gl/arrow';

const LENGTH = 2000;

const rainAmounts = Float32Array.from({length: LENGTH}, () =>
  Number((Math.random() * 20).toFixed(1))
);

const rainDates = Array.from(
  {length: LENGTH},
  (_, i) => new Date(Date.now() - 1000 * 60 * 60 * 24 * i)
);

const arraysData = [
  {array: rainAmounts, name: 'precipitation', type: VECTOR_TYPES.FLOAT},
  {array: rainDates, name: 'date', type: VECTOR_TYPES.DATE}
];

const arrayBuffer = encodeSync(arraysData, ArrowWriter);

Options

Option	Type	Default	Description

Dependencies

Apache Arrow JS library is included into the bundle.