从Array中删除所有不具有一个公共字段的其他Array中的所有内容

I have two arrays, like this:

我有两个数组,像这样:

a = [
    {"id": "peter", "age": "25"},
    {"id": "dave", "age": "34"},
    {"id": "jack", "age": "28"}];

b = [{"id": "peter", "profession": "engineer"}];
a