array.test.js

import * as array from './array.js'
import * as t from './testing.js'

/**
 * @param {t.TestCase} _tc
 */
export const testAppend = _tc => {
  const arr = [1, 2, 3]
  array.appendTo(arr, array.copy(arr))
  t.compareArrays(arr, [1, 2, 3, 1, 2, 3])
}

/**
 * @param {t.TestCase} _tc
 */
export const testBasic = _tc => {
  const arr = array.create()
  array.appendTo(arr, array.from([1]))
  t.assert(array.last(arr) === 1)
}

/**
 * @param {t.TestCase} _tc
 */
export const testflatten = _tc => {
  const arr = [[1, 2, 3], [4]]
  t.compareArrays(array.flatten(arr), [1, 2, 3, 4])
}

/**
 * @param {t.TestCase} _tc
 */
export const testEvery = _tc => {
  const arr = [1, 2, 3]
  t.assert(array.every(arr, x => x <= 3))
  t.assert(!array.every(arr, x => x < 3))
  t.assert(array.some(arr, x => x === 2))
  t.assert(!array.some(arr, x => x === 42))
}

/**
 * @param {t.TestCase} _tc
 */
export const testIsArray = _tc => {
  t.assert(array.isArray([]))
  t.assert(array.isArray([1]))
  t.assert(array.isArray(Array.from(new Set([3]))))
  t.assert(!array.isArray(1))
  t.assert(!array.isArray(0))
  t.assert(!array.isArray(''))
}

/**
 * @param {t.TestCase} _tc
 */
export const testUnique = _tc => {
  t.compare([1, 2], array.unique([1, 2, 1, 2, 2, 1]))
  t.compare([], array.unique([]))
  t.compare([{ el: 1 }], array.uniqueBy([{ el: 1 }, { el: 1 }], o => o.el))
  t.compare([], array.uniqueBy([], o => o))
}