javascript中的关联数组，使用pair / tuple作为多值键/索引(Associative array in javascript using a pair/tuple as multi

javascript中的关联数组，使用pair / tuple作为多值键/索引(Associative array in javascript using a pair/tuple as multi-value key/index)

在python中，我可以使用元组作为字典的关键。 什么是javascript中的等价物？

>>> d = {} >>> d[(1,2)] = 5 >>> d[(2,1)] = 6 >>> d {(1, 2): 5, (2, 1): 6}

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对于那些有兴趣的人，我有两个阵列......

positions = ...

normals = ...

我需要制作第三个位置/正常对数组，但不希望有重复对。 我的关联数组将让我检查是否有一个现有的[(posIdx,normalIdx)]对重用或创建一个如果我没有。

我需要一些使用双值键索引的方法。 我可以使用一个字符串，但这似乎比两个数字慢一点。

In python, I can use tuples as the key to a dictionary. What's the equivalent in javascript?

>>> d = {} >>> d[(1,2)] = 5 >>> d[(2,1)] = 6 >>> d {(1, 2): 5, (2, 1): 6}

---

For those who are interested, I have two arrays...

positions = ...

normals = ...

I need to make a third array of position/normal pairs, but don't want to have duplicate pairs. My associative array would let me check to see if I have an existing [(posIdx,normalIdx)] pair to reuse or create one if I don't.

I need some way of indexing using a two-value key. I could just use a string, but that seems a bit slower than two numbers.

最满意答案

Javascript没有元组，但您可以使用数组。

>>> d = {} >>> d[[1,2]] = 5 >>> d[[2,1]] = 6 >>> d Object {1,2: 5, 2,1: 6}

Javascript does not have tuples but you can use arrays instead.

>>> d = {} >>> d[[1,2]] = 5 >>> d[[2,1]] = 6 >>> d Object {1,2: 5, 2,1: 6}