7kyu Multiplication - Generators #2

題目：

Generators can be used to wonderful things. You can use them for numerous things, but here is one specific example. You are studying for a test so you must practice your multiplication, but you don't have a multiplication table showing the different examples. You have decided to create a generator that prints out a limitless list of time tables.

發電機能夠用來作奇妙的事情。你能夠用它們來作不少事情，但這裏有一個具體的例子。你在爲一個測試而學習，因此你必須練習乘法，可是你沒有一個乘法表來顯示不一樣的例子。您已經決定建立一個生成器，它打印出一個無限的時間表列表。

Task

Your generator must take one parameter a then everytime the generator is called you must return a string in the format of: 'a x b = c' where c is the answer. Also, the value of b, which starts at 1, must increment by 1 each time!

您的生成器必須接受一個參數，而後每次調用生成器時，必須以「a x b=c」的格式返回一個字符串，其中c就是答案。一樣，從1開始的b的值必須每次遞增1！

Sample Tests:

Test.describe("Fixed Tests", _ => {
  var gen = generator(1);
  Test.assertEquals(gen.next().value, '1 x 1 = 1', '1 x 1 = 1')
  Test.assertEquals(gen.next().value, '1 x 2 = 2', '1 x 2 = 2')
  Test.assertEquals(gen.next().value, '1 x 3 = 3', '1 x 3 = 3')
  Test.assertEquals(gen.next().value, '1 x 4 = 4', '1 x 4 = 4')
  Test.assertEquals(gen.next().value, '1 x 5 = 5', '1 x 5 = 5')
});

 

答案：