The third element of the array is the number of points for this assignment type, so I have to invoke the to_s method to convert that integer into a string.

数组第三个元素是该任务类型的分数，所以我必须调用to_s方法，将该整数转换为字符串。

youdao

Well I need to take that number and I'm going to turn it into a string. So notice what I'm going to do right here. I take that number and convert it into a string. That's an example of that type conversion we did earlier on. By doing that it makes it possible for me to treat it as an ordered sequence of characters.

我可能得把这个数字变为字符串,请注意我这里是怎么做的,我把这个数字,转化为字符串了,这是我们之前学过的,类型转换的例子,这么一来我就能把它按照有序的。

麻省理工公开课 - 计算机科学及编程导论课程节选