二维数组转json对象

Question

求教各位大佬，如何把下面的数组
[["Beijing","100"],["Shanghai","200"]["Guangzhou","300"]]
转换为
[{Beijing:"100"},{Shanghai:"200"},{Guangzhou:"300"}]

谢谢！！！

Answer 1

[["Beijing","100"],["Shanghai","200"],["Guangzhou","300"]].reduce((s,v)=>(s.push({[v[0]]:v[1]}),s),[])

你有疑问的应该就是 [v[0]] 这个写法了。声明的时候使用方括号可以放表达式。

Answer 2

    const toObject = (arr) => {
      return arr.reduce((prev, curr) => {
        return [...prev, { [curr[0]]: curr[1] }]
      }, [])
    }

测试用例如下：

    const region = [['Beijing', '100'], ['Shanghai', '200'], ['Guangzhou', '300']]

    const toObject = (arr) => {
      return arr.reduce((prev, curr) => {
        return [...prev, { [curr[0]]: curr[1] }]
      }, [])
    }
    const newObj = toObject(region)

    expect(newObj).toStrictEqual([{ Beijing: '100' }, { Shanghai: '200' }, { Guangzhou: '300' }])

Answer 3

简单啊，我们来点优雅的代码

let newAreay = arr.map(e => ({ ‘’ + e[0]: e[1]}))