26 lines
474 B
Markdown
26 lines
474 B
Markdown
---
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title: 数组
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updated: 2022-03-15 07:59:11Z
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created: 2022-03-15 07:44:09Z
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---
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## 提取数组的key
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这个并不比直接用`for in` 快，map内部就是用的`for in`。
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```js
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var str = {}
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table.map(num,lambda(v,k,r) table.push(str,v) )
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```
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## 更改数组的元素
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```js
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var num1 = table.map(num,lambda(v,k) tonumber(v) )
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```
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## 交换数组的key和value
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可同时处理数组元素
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```js
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var newt=table.map(t,function(v,k,result){
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result[tonumber(v)]=k
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})
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```
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