data-fns/src/lib/times.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 { times } from './times'

describe('times', () => {
  it('should call the given callback function the specified number of times and return an array of the results', () => {
    const result = times(5, (index) => index * 2)
    expect(result).toEqual([0, 2, 4, 6, 8])
  })

  it('should return an empty array when called with an iteration count of 0', () => {
    const result = times(0, (index) => index)
    expect(result).toEqual([])
  })

  it('should return an array of undefined values when called with a callback that returns undefined', () => {
    const result = times(5, () => undefined)
    expect(result).toEqual([undefined, undefined, undefined, undefined, undefined])
  })

  it('should call the given callback function with the correct index for each iteration', () => {
    const callback = jest.fn()
    times(3, callback)
    expect(callback).toHaveBeenCalledWith(0)
    expect(callback).toHaveBeenCalledWith(1)
    expect(callback).toHaveBeenCalledWith(2)
  })
})