如何对ES6`Set`进行排序? [英] How can I sort an ES6 `Set`?

问题描述

new Set(['b', 'a', 'c']).sort()引发TypeError: set.sort is not a function.如何对Set进行排序以确保特定的迭代顺序?

new Set(['b', 'a', 'c']).sort() throws TypeError: set.sort is not a function. How can I sort a Set to ensure a particular iteration order?

推荐答案

集合不是有序的抽象数据结构.

A set is not an ordered abstract data structure.

A Set始终具有相同的迭代顺序-元素插入顺序[1]，因此，当您对其进行迭代(通过迭代方法，通过调用Symbol.iterator或通过for .. of loop)时，可以总是希望如此.

A Set however always has the same iteration order - element insertion order [1], so when you iterate it (by an iterating method, by calling Symbol.iterator, or by a for.. of loop) you can always expect that.

您始终可以将集合转换为数组并对其进行排序.

You can always convert the set to an array and sort that.

Array.from(new Set(["b","a","c"])).sort();
[...(new Set(["b","a","c"]))].sort(); // with spread.

[1] forEach 和 CreateSetIterator

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