/* eslint-env mocha,chai */
const { expect } = require('chai')

const reverse = arr => {
  let left = 0
  let right = arr.length - 1

  while (left < right) {
    const temp = arr[left]
    arr[left] = arr[right]
    arr[right] = temp
    left++
    right--
  }

  return arr
}

describe('reverse', () => {
  it('reverses "on"', () => {
    const result1 = reverse(['o', 'n'])
    expect(result1).to.deep.equal(['n', 'o'])
  })
  it('reverses "racecar"', () => {
    const result2 = reverse(['r', 'a', 'c', 'e', 'c', 'a', 'r'])
    expect(result2).to.deep.equal(['r', 'a', 'c', 'e', 'c', 'a', 'r'])
  })
  it('returns arr when empty', () => {
    const result3 = reverse([])
    expect(result3).to.deep.equal([])
  })
})