Array.prototype.filter = undefined
// /*/ // ⚡
export const tests = []
const t = (f) => tests.push(f)

const check1 = (el) => el % 2 === 0
const check2 = (el, i) => el % 3 === 0 && i % 2 === 0
const check3 = (el) => Array.isArray(el)
const check4 = (el, i, arr) =>
  typeof el !== 'number' && i % 2 !== 0 && arr.includes(true)
const check5 = (el, i) =>
  (typeof el === 'number' || typeof el === 'boolean') && i > 5
const check6 = (el) => el.region === 'South' || el.region === 'West'

// Filter
t(({ eq, ctx }) =>
  eq(filter(ctx.onlyNumbers, check1), [
    10,
    -10,
    20,
    86,
    2,
    32,
    450,
    950,
    66,
    150,
  ]),
)
t(({ eq, ctx }) => eq(filter(ctx.onlyNumbers, check2), [15, 33, 450, 66]))
t(({ eq, ctx }) =>
  eq(filter(ctx.mixedTypes, check3), [
    ['how', 'are', 'the', 2],
    ['iu', 2],
  ]),
)
t(({ eq, ctx }) =>
  eq(filter(ctx.mixedTypes, check4), [
    ['how', 'are', 'the', 2],
    ['iu', 2],
    'good',
    true,
  ]),
)
t(({ eq, ctx }) =>
  eq(filter(ctx.mixedTypes, check5), [-10, 2, 65, 2, 2678, true]),
)

// Reject
t(({ eq, ctx }) => eq(reject(ctx.onlyNumbers, check1), [-95, 15, 3, 5, 33, 45]))
t(({ eq, ctx }) =>
  eq(reject(ctx.onlyNumbers, check2), [
    10,
    -10,
    20,
    -95,
    86,
    2,
    3,
    5,
    32,
    45,
    950,
    150,
  ]),
)
t(({ eq, ctx }) =>
  eq(reject(ctx.mixedTypes, check3), [
    1,
    2,
    4,
    8,
    'hello',
    12,
    -10,
    'of',
    'well',
    2,
    65,
    'good',
    2,
    2678,
    'be',
    true,
  ]),
)

t(({ eq, ctx }) =>
  eq(reject(ctx.mixedTypes, check4), [
    1,
    2,
    4,
    8,
    'hello',
    12,
    -10,
    'of',
    'well',
    2,
    65,
    2,
    2678,
    'be',
  ]),
)
t(({ eq, ctx }) =>
  eq(reject(ctx.mixedTypes, check5), [
    1,
    2,
    4,
    8,
    'hello',
    12,
    ['how', 'are', 'the', 2],
    'of',
    ['iu', 2],
    'well',
    'good',
    'be',
  ]),
)

// Partition
t(({ eq, ctx }) =>
  eq(partition(ctx.onlyNumbers, check1), [
    [10, -10, 20, 86, 2, 32, 450, 950, 66, 150],
    [-95, 15, 3, 5, 33, 45],
  ]),
)
t(({ eq, ctx }) =>
  eq(partition(ctx.onlyNumbers, check2), [
    [15, 33, 450, 66],
    [10, -10, 20, -95, 86, 2, 3, 5, 32, 45, 950, 150],
  ]),
)
t(({ eq, ctx }) =>
  eq(partition(ctx.mixedTypes, check3), [
    [
      ['how', 'are', 'the', 2],
      ['iu', 2],
    ],
    [
      1,
      2,
      4,
      8,
      'hello',
      12,
      -10,
      'of',
      'well',
      2,
      65,
      'good',
      2,
      2678,
      'be',
      true,
    ],
  ]),
)
t(({ eq, ctx }) =>
  eq(partition(ctx.mixedTypes, check4), [
    [['how', 'are', 'the', 2], ['iu', 2], 'good', true],
    [1, 2, 4, 8, 'hello', 12, -10, 'of', 'well', 2, 65, 2, 2678, 'be'],
  ]),
)
t(({ eq, ctx }) =>
  eq(partition(ctx.mixedTypes, check5), [
    [-10, 2, 65, 2, 2678, true],
    [
      1,
      2,
      4,
      8,
      'hello',
      12,
      ['how', 'are', 'the', 2],
      'of',
      ['iu', 2],
      'well',
      'good',
      'be',
    ],
  ]),
)

/// Filter on an object
t(({ eq, ctx }) =>
  eq(filter(ctx.statesData, check6), [
    {
      tag: 'AL',
      name: 'Alabama',
      capital: 'Montgomery',
      region: 'South',
    },
    { tag: 'AK', name: 'Alaska', capital: 'Juneau', region: 'West' },
    { tag: 'AZ', name: 'Arizona', capital: 'Phoenix', region: 'West' },
    {
      tag: 'AR',
      name: 'Arkansas',
      capital: 'Little Rock',
      region: 'South',
    },
    {
      tag: 'CA',
      name: 'California',
      capital: 'Sacramento',
      region: 'West',
    },
    { tag: 'CO', name: 'Colorado', capital: 'Denver', region: 'West' },
    { tag: 'DE', name: 'Delaware', capital: 'Dover', region: 'South' },
    {
      tag: 'DC',
      name: 'District Of Columbia',
      capital: 'Washington',
      region: 'South',
    },
    {
      tag: 'FL',
      name: 'Florida',
      capital: 'Tallahassee',
      region: 'South',
    },
    { tag: 'GA', name: 'Georgia', capital: 'Atlanta', region: 'South' },
    { tag: 'HI', name: 'Hawaii', capital: 'Honolulu', region: 'West' },
    { tag: 'ID', name: 'Idaho', capital: 'Boise', region: 'West' },
    {
      tag: 'KY',
      name: 'Kentucky',
      capital: 'Frankfort',
      region: 'South',
    },
    {
      tag: 'LA',
      name: 'Louisiana',
      capital: 'Baton Rouge',
      region: 'South',
    },
    {
      tag: 'MD',
      name: 'Maryland',
      capital: 'Annapolis',
      region: 'South',
    },
    {
      tag: 'MS',
      name: 'Mississippi',
      capital: 'Jackson',
      region: 'South',
    },
    { tag: 'MT', name: 'Montana', capital: 'Helena', region: 'West' },
    { tag: 'NV', name: 'Nevada', capital: 'Carson City', region: 'West' },
    {
      tag: 'NM',
      name: 'New Mexico',
      capital: 'Santa Fe',
      region: 'West',
    },
    {
      tag: 'NC',
      name: 'North Carolina',
      capital: 'Raleigh',
      region: 'South',
    },
    {
      tag: 'OK',
      name: 'Oklahoma',
      capital: 'Oklahoma City',
      region: 'South',
    },
    { tag: 'OR', name: 'Oregon', capital: 'Salem', region: 'West' },
    {
      tag: 'SC',
      name: 'South Carolina',
      capital: 'Columbia',
      region: 'South',
    },
    {
      tag: 'TN',
      name: 'Tennessee',
      capital: 'Nashville',
      region: 'South',
    },
    { tag: 'TX', name: 'Texas', capital: 'Austin', region: 'South' },
    {
      tag: 'UT',
      name: 'Utah',
      capital: 'Salt Lake City',
      region: 'West',
    },
    { tag: 'VA', name: 'Virginia', capital: 'Richmond', region: 'South' },
    { tag: 'WA', name: 'Washington', capital: 'Olympia', region: 'West' },
    {
      tag: 'WV',
      name: 'West Virginia',
      capital: 'Charleston',
      region: 'South',
    },
    { tag: 'WY', name: 'Wyoming', capital: 'Cheyenne', region: 'West' },
  ]),
)

export const setup = () => {
  const onlyNumbers = Object.freeze([
    10,
    -10,
    20,
    -95,
    15,
    86,
    2,
    3,
    5,
    32,
    33,
    45,
    450,
    950,
    66,
    150,
  ])
  const mixedTypes = Object.freeze([
    1,
    2,
    4,
    8,
    'hello',
    12,
    -10,
    ['how', 'are', 'the', 2],
    'of',
    ['iu', 2],
    'well',
    2,
    65,
    'good',
    2,
    2678,
    'be',
    true,
  ])

  const statesData = Object.freeze(
    [
      { tag: 'AL', name: 'Alabama', capital: 'Montgomery', region: 'South' },
      { tag: 'AK', name: 'Alaska', capital: 'Juneau', region: 'West' },
      { tag: 'AZ', name: 'Arizona', capital: 'Phoenix', region: 'West' },
      { tag: 'AR', name: 'Arkansas', capital: 'Little Rock', region: 'South' },
      { tag: 'CA', name: 'California', capital: 'Sacramento', region: 'West' },
      { tag: 'CO', name: 'Colorado', capital: 'Denver', region: 'West' },
      {
        tag: 'CT',
        name: 'Connecticut',
        capital: 'Hartford',
        region: 'Northeast',
      },
      { tag: 'DE', name: 'Delaware', capital: 'Dover', region: 'South' },
      {
        tag: 'DC',
        name: 'District Of Columbia',
        capital: 'Washington',
        region: 'South',
      },
      { tag: 'FL', name: 'Florida', capital: 'Tallahassee', region: 'South' },
      { tag: 'GA', name: 'Georgia', capital: 'Atlanta', region: 'South' },
      { tag: 'HI', name: 'Hawaii', capital: 'Honolulu', region: 'West' },
      { tag: 'ID', name: 'Idaho', capital: 'Boise', region: 'West' },
      {
        tag: 'IL',
        name: 'Illinois',
        capital: 'Springfield',
        region: 'Midwest',
      },
      {
        tag: 'IN',
        name: 'Indiana',
        capital: 'Indianapolis',
        region: 'Midwest',
      },
      { tag: 'IA', name: 'Iowa', capital: 'Des Moines', region: 'Midwest' },
      { tag: 'KS', name: 'Kansas', capital: 'Topeka', region: 'Midwest' },
      { tag: 'KY', name: 'Kentucky', capital: 'Frankfort', region: 'South' },
      { tag: 'LA', name: 'Louisiana', capital: 'Baton Rouge', region: 'South' },
      { tag: 'ME', name: 'Maine', capital: 'Augusta', region: 'Northeast' },
      { tag: 'MD', name: 'Maryland', capital: 'Annapolis', region: 'South' },
      {
        tag: 'MA',
        name: 'Massachusetts',
        capital: 'Boston',
        region: 'Northeast',
      },
      { tag: 'MI', name: 'Michigan', capital: 'Lansing', region: 'Midwest' },
      { tag: 'MN', name: 'Minnesota', capital: 'St. Paul', region: 'Midwest' },
      { tag: 'MS', name: 'Mississippi', capital: 'Jackson', region: 'South' },
      {
        tag: 'MO',
        name: 'Missouri',
        capital: 'Jefferson City',
        region: 'Midwest',
      },
      { tag: 'MT', name: 'Montana', capital: 'Helena', region: 'West' },
      { tag: 'NE', name: 'Nebraska', capital: 'Lincoln', region: 'Midwest' },
      { tag: 'NV', name: 'Nevada', capital: 'Carson City', region: 'West' },
      {
        tag: 'NH',
        name: 'New Hampshire',
        capital: 'Concord',
        region: 'Northeast',
      },
      {
        tag: 'NJ',
        name: 'New Jersey',
        capital: 'Trenton',
        region: 'Northeast',
      },
      { tag: 'NM', name: 'New Mexico', capital: 'Santa Fe', region: 'West' },
      { tag: 'NY', name: 'New York', capital: 'Albany', region: 'Northeast' },
      {
        tag: 'NC',
        name: 'North Carolina',
        capital: 'Raleigh',
        region: 'South',
      },
      {
        tag: 'ND',
        name: 'North Dakota',
        capital: 'Bismarck',
        region: 'Midwest',
      },
      { tag: 'OH', name: 'Ohio', capital: 'Colombus', region: 'Midwest' },
      {
        tag: 'OK',
        name: 'Oklahoma',
        capital: 'Oklahoma City',
        region: 'South',
      },
      { tag: 'OR', name: 'Oregon', capital: 'Salem', region: 'West' },
      {
        tag: 'PA',
        name: 'Pennsylvania',
        capital: 'Harrisburg',
        region: 'Northeast',
      },
      {
        tag: 'RI',
        name: 'Rhode Island',
        capital: 'Providence',
        region: 'Northeast',
      },
      {
        tag: 'SC',
        name: 'South Carolina',
        capital: 'Columbia',
        region: 'South',
      },
      { tag: 'SD', name: 'South Dakota', capital: 'Pierre', region: 'Midwest' },
      { tag: 'TN', name: 'Tennessee', capital: 'Nashville', region: 'South' },
      { tag: 'TX', name: 'Texas', capital: 'Austin', region: 'South' },
      { tag: 'UT', name: 'Utah', capital: 'Salt Lake City', region: 'West' },
      {
        tag: 'VT',
        name: 'Vermont',
        capital: 'Montpelier',
        region: 'Northeast',
      },
      { tag: 'VA', name: 'Virginia', capital: 'Richmond', region: 'South' },
      { tag: 'WA', name: 'Washington', capital: 'Olympia', region: 'West' },
      {
        tag: 'WV',
        name: 'West Virginia',
        capital: 'Charleston',
        region: 'South',
      },
      { tag: 'WI', name: 'Wisconsin', capital: 'Madison', region: 'Midwest' },
      { tag: 'WY', name: 'Wyoming', capital: 'Cheyenne', region: 'West' },
    ].map((e) => Object.freeze(e)),
  )

  Object.getPrototypeOf([]).proto = ' [avoid for..in] '

  return { onlyNumbers, mixedTypes, statesData }
}

Object.freeze(tests)