在javascript中转换数组

Transforming an array in javascript

本文关键字：数组 转换 javascript      更新时间：2023-09-26

我是javascript的新手，正在努力寻找这个问题的答案。

我有一个对象与网络接口和详细信息的列表。我猜这是一个对象数组?: 

> console.log(net);
[ { Interface: 'wlan0:',
    bytes: { Receive: '26087318', Transmit: '8475' },
    packets: { Receive: '379665', Transmit: '52' },
    errs: { Receive: '0', Transmit: '0' },
    drop: { Receive: '0', Transmit: '0' },
    fifo: { Receive: '0', Transmit: '0' },
    frame: { Receive: '0' },
    compressed: { Receive: '0', Transmit: '0' },
    multicast: { Receive: '0' },
    colls: { Transmit: '0' },
    carrier: { Transmit: '0' } },
  { Interface: 'lo:',
    bytes: { Receive: '228483', Transmit: '228483' },
    packets: { Receive: '4046', Transmit: '4046' },
    errs: { Receive: '0', Transmit: '0' },
    drop: { Receive: '0', Transmit: '0' },
    fifo: { Receive: '0', Transmit: '0' },
    frame: { Receive: '0' },
    compressed: { Receive: '0', Transmit: '0' },
    multicast: { Receive: '0' },
    colls: { Transmit: '0' },
    carrier: { Transmit: '0' } },
  { Interface: 'mon0:',
    bytes: { Receive: '285735889', Transmit: '0' },
    packets: { Receive: '1753373', Transmit: '0' },
    errs: { Receive: '0', Transmit: '0' },
    drop: { Receive: '1765559', Transmit: '0' },
    fifo: { Receive: '0', Transmit: '0' },
    frame: { Receive: '0' },
    compressed: { Receive: '0', Transmit: '0' },
    multicast: { Receive: '0' },
    colls: { Transmit: '0' },
    carrier: { Transmit: '0' } },
  { Interface: 'eth0:',
    bytes: { Receive: '6982603', Transmit: '22526425' },
    packets: { Receive: '58906', Transmit: '384822' },
    errs: { Receive: '0', Transmit: '0' },
    drop: { Receive: '0', Transmit: '0' },
    fifo: { Receive: '0', Transmit: '0' },
    frame: { Receive: '0' },
    compressed: { Receive: '0', Transmit: '0' },
    multicast: { Receive: '0' },
    colls: { Transmit: '0' },
    carrier: { Transmit: '0' } } ]

我想转换成这个结果:

> console.log(result);
{ lo: 'lo',
  mon0: 'mon0',
  eth0: 'eth0',
  wlan0: 'wlan0' }

我在节点REPL控制台尝试了一些事情，但我没有得到任何地方:

> var result = {};
undefined
> Object.keys(net).forEach(function(ifname) {
... result[ifname] = ifname;
... });
undefined
> result
{ '0': '0', '1': '1', '2': '2', '3': '3' }

另一个尝试:

> procfs.net(function(err,net){
... result = net.map(function(a) {return a.Interface;})
... });
undefined
> console.log(result);
[ 'wlan0:', 'lo:', 'mon0:', 'eth0:' ]
undefined

我可以单独引用所需的数据元素，只是努力将它们放在一起:

> net[0].Interface
'wlan0:'
> net[1].Interface
'lo:'
> net[2].Interface
'mon0:'
> net[3].Interface
'eth0:'

帮助感激!

EDIT:添加了删除尾随冒号字符的代码，以完全匹配所请求的输出格式

只要像这样减少:

var result = net.reduce((ifaces,i) => { 
  var name = i.Interface.replace(/:$/,'');
  ifaces[name]=name; 
  return ifaces; 
},{})

的示例输出
>>result
{ wlan0: "wlan0", lo: "lo", mon0: "mon0", eth0: "eth0" }

或者，可以使用Lodash (https://lodash.com/):

)
_.keyBy(net.map(i=>i.Interface.slice(0,-1)))

您需要从Interface属性中获取值，并将该值分配给对象中的相同键。

var net = [{ Interface: 'wlan0:', bytes: { Receive: '26087318', Transmit: '8475' }, packets: { Receive: '379665', Transmit: '52' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '0', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }, { Interface: 'lo:', bytes: { Receive: '228483', Transmit: '228483' }, packets: { Receive: '4046', Transmit: '4046' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '0', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }, { Interface: 'mon0:', bytes: { Receive: '285735889', Transmit: '0' }, packets: { Receive: '1753373', Transmit: '0' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '1765559', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }, { Interface: 'eth0:', bytes: { Receive: '6982603', Transmit: '22526425' }, packets: { Receive: '58906', Transmit: '384822' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '0', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }],
    result = {};
net.forEach(function (o) {
    result[o.Interface] = o.Interface;
});
console.log(result);

这是一个使用Array.reduce()的完美示例!

net.reduce((interfaces, interface) => {
  interfaces[interface.Interface.slice(0, -1)] = interface.Interface.slice(0, -1)
  return interfaces
}, {})


const net = [{ Interface: 'wlan0:', bytes: { Receive: '26087318', Transmit: '8475' }, packets: { Receive: '379665', Transmit: '52' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '0', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }, { Interface: 'lo:', bytes: { Receive: '228483', Transmit: '228483' }, packets: { Receive: '4046', Transmit: '4046' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '0', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }, { Interface: 'mon0:', bytes: { Receive: '285735889', Transmit: '0' }, packets: { Receive: '1753373', Transmit: '0' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '1765559', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }, { Interface: 'eth0:', bytes: { Receive: '6982603', Transmit: '22526425' }, packets: { Receive: '58906', Transmit: '384822' }, errs: { Receive: '0', Transmit: '0' }, drop: { Receive: '0', Transmit: '0' }, fifo: { Receive: '0', Transmit: '0' }, frame: { Receive: '0' }, compressed: { Receive: '0', Transmit: '0' }, multicast: { Receive: '0' }, colls: { Transmit: '0' }, carrier: { Transmit: '0' } }]
const result = net.reduce((interfaces, interface) => {
  interfaces[interface.Interface.slice(0, -1)] = interface.Interface.slice(0, -1)
  return interfaces
}, {})
console.log(result)

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