The helper object isSenior is used to select only the students graduating this year, and the helper object getGpa extracts the GPA field from a given student.
helper对象isSenior 用来选择今年毕业的学生，healper 对象getGpa 提取指定学生的GPA字段。
The helper object isSenior is used to select only the students graduating this year, and the helper object getGpa extracts the GPA field from a given student.
helper对象isSenior 用来选择今年毕业的学生，healper 对象getGpa 提取指定学生的GPA字段。
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