@steelbreeze/pivot/src/example/simple.ts

Minimal TypeScript / JavaScript n-cube library

import { property, pivot, query } from '..';
import { distinct } from './distinct';

interface Data {
	a: number;
	b: number;
	c: string;
}

// a simple data set comprising 4 rows with some dimensional data
const data: Data[] = [
	{ a: 1, b: 1, c: 'Row 1' },
	{ a: 2, b: 1, c: 'Row 2' },
	{ a: 1, b: 2, c: 'Row 3' },
	{ a: 2, b: 2, c: 'Row 4' },
	{ a: 2, b: 2, c: 'Row 5' }
];

// create a dimension with pre-defined values for the property 'a' in the data.
const x = [1, 2, 3].map(property<Data>('a'));

// create a dimension with derived values for the property 'b' in the data.
const y = data.map(row => row.b).filter(distinct).map(property<Data>('b'));

// create a cube from the data using the x and y dimensions
const cube = pivot(data, x, y);

// Display the values of 'c' seen in the data
console.log(query(cube, records => records.map(t => t.c)));