For a game, I have a collection of 'houses' and each house belongs to a 'city'. I want to separate this collection (it's an array) based on this city, so each city will have its own array of houses. I found no built-in array function to do this (such as an For a game, I have a collection of 'houses' and
阅读背景：
按字段拆分/分组数组元素
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