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Kotlin 复合排序语法糖/多字段排序语法糖

 2 years ago
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Kotlin 复合排序语法糖/多字段排序语法糖

2021-10-02

平时其实很少需要这样的条件，但偶尔还是会遇到，例如：一个股池，先按板块类型排序，再在这个基础上按其跌涨幅排序。Java 中有现成的 compare thenComparing，但 kotlin 中好像怎么点都点不出来，找了找语法糖，于是找到了这个：

        arrayListOf<Stock>()
            .sortedWith(compareByDescending<Stock> { it.type }
                .thenByDescending { it.upDown })

拿来即用。

参考：https://stackoverflow.com/questions/369512/how-to-compare-objects-by-multiple-fields


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