data-fns/src/lib/euclideanSilences.test.ts

This library provides utility functions for working with array data that are useful in many contexts, including creative coding. It offers generic functions that perform common operations such as offsetting an array, generating an array based on a callbac

import { euclideanSilences } from './euclideanSilences'

describe('euclideanSilences', () => {
  test('should return indices where notes do not occur with even spacing', () => {
    expect(euclideanSilences(8, 3)).toEqual([1, 3, 4, 6, 7])
  })

  test('should return indices where notes do not occur with spacing as even as possible', () => {
    expect(euclideanSilences(16, 5)).toEqual([1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 15])
  })

  test('should return indices where notes do not occur rotated by the optional rotation param', () => {
    expect(euclideanSilences(8, 3, 1)).toEqual([0, 2, 4, 5, 7])
    expect(euclideanSilences(8, 3, 3)).toEqual([1, 2, 4, 6, 7])
    expect(euclideanSilences(8, 3, 4)).toEqual([0, 2, 3, 5, 7])
  })

  test('should return an empty sequence when steps are 0', () => {
    expect(euclideanSilences(0, 0)).toEqual([])
    expect(euclideanSilences(0, 1)).toEqual([])
  })
  test('should return as many spaces as step when given no notes', () => {
    expect(euclideanSilences(1, 0)).toEqual([0])
    expect(euclideanSilences(2, 0)).toEqual([0, 1])
  })

  test('should return all indices when notes equal steps', () => {
    expect(euclideanSilences(4, 4)).toEqual([])
  })

  test('should return an error message when inputs are negative', () => {
    expect(() => euclideanSilences(-2, 3)).toThrowError('Inputs must be positive integers')
  })
})