html JS Bin //来源http://jsbin.com/muqigog

Posted 2021-05-11

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console.clear()

const addCounter = list => [...list, 0]

const removeCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    ...list.slice(index + 1)
  ];
}

const incrementCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    list[index] + 1,
    ...list.slice(index + 1)
  ]
}

const testAddCounter = () => {
  const listBefore = []
  const listAfter = [0]

  deepFreeze(listBefore)

  expect(
    addCounter(listBefore)
  ).toEqual(listAfter)
}

const testRemoveCounter = () => {
  const listBefore = [0, 10, 20]
  const listAfter = [0, 20]

  deepFreeze(listBefore)

  expect(
    removeCounter(listBefore, 1)
  ).toEqual(listAfter)
}

const testIncrementCounter = () => {
  const listBefore = [0, 10, 20]
  const listAfter = [0, 11, 20]
  
  deepFreeze(listBefore)

  expect(
    incrementCounter(listBefore, 1)
  ).toEqual(listAfter)
}

testAddCounter()
testRemoveCounter()
testIncrementCounter()

console.log('All tests passed.')

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/expect/1.20.2/expect.min.js"></script>
  <script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
<script id="jsbin-javascript">
console.clear()

const addCounter = list => [...list, 0]

const removeCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    ...list.slice(index + 1)
  ];
}

const incrementCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    list[index] + 1,
    ...list.slice(index + 1)
  ]
}

const testAddCounter = () => {
  const listBefore = []
  const listAfter = [0]

  deepFreeze(listBefore)

  expect(
    addCounter(listBefore)
  ).toEqual(listAfter)
}

const testRemoveCounter = () => {
  const listBefore = [0, 10, 20]
  const listAfter = [0, 20]

  deepFreeze(listBefore)

  expect(
    removeCounter(listBefore, 1)
  ).toEqual(listAfter)
}

const testIncrementCounter = () => {
  const listBefore = [0, 10, 20]
  const listAfter = [0, 11, 20]
  
  deepFreeze(listBefore)

  expect(
    incrementCounter(listBefore, 1)
  ).toEqual(listAfter)
}

testAddCounter()
testRemoveCounter()
testIncrementCounter()

console.log('All tests passed.')
</script>



<script id="jsbin-source-javascript" type="text/javascript">console.clear()

const addCounter = list => [...list, 0]

const removeCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    ...list.slice(index + 1)
  ];
}

const incrementCounter = (list, index) => {
  return [
    ...list.slice(0, index),
    list[index] + 1,
    ...list.slice(index + 1)
  ]
}

const testAddCounter = () => {
  const listBefore = []
  const listAfter = [0]

  deepFreeze(listBefore)

  expect(
    addCounter(listBefore)
  ).toEqual(listAfter)
}

const testRemoveCounter = () => {
  const listBefore = [0, 10, 20]
  const listAfter = [0, 20]

  deepFreeze(listBefore)

  expect(
    removeCounter(listBefore, 1)
  ).toEqual(listAfter)
}

const testIncrementCounter = () => {
  const listBefore = [0, 10, 20]
  const listAfter = [0, 11, 20]
  
  deepFreeze(listBefore)

  expect(
    incrementCounter(listBefore, 1)
  ).toEqual(listAfter)
}

testAddCounter()
testRemoveCounter()
testIncrementCounter()

console.log('All tests passed.')</script></body>
</html>

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