sortBy is an array of sort objects that determines how the returned array is sorted.

sortBy 是一个 sort 对象数组，用于确定如何对返回的数组排序。

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SortBy: the sort order of the search results, based on the columns that are specified.

SortBy：基于指定的列，搜索结果的排列顺序。

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This will let us add lambda-friendly (and potentially parallel-friendly) methods like forEach() to List. By adding an extension method to List for sortBy(), our example now looks like

这种做法允许我们加入lambda友好的（且可能是并行友好的）方法，比如说给List加入forEach()。

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