[英]Extract values from a list of objects in javascript using underscore
I have a list of objects, where each object has numerical values: 我有一个对象列表,其中每个对象都有数值:
var cpuInfo = [
{ user: 189625143,
nice: 0,
sys: 40239022,
idle: 2087123838,
irq: 720490 },
{ user: 76627160,
nice: 0,
sys: 35444113,
idle: 2204916386,
irq: 18233303 }
]
I need to calculate the value of idle
divided by the sum of all values. 我需要计算
idle
值除以所有值的总和。
For that, I need to get the sum of all of the values in all of the objects. 为此,我需要获取所有对象中所有值的总和。
I've tried doing this to extract just the values: 我尝试这样做只是提取值:
_(cpuInfo).each(_.values)
I expected it to return a list like so: 我希望它返回这样的列表:
[189625143, 0, 40239022, 2087123838, 720490, 76627160, 0, 35444113, 2204916386, 18233303]
But for some reason it returns the exact same thing I started out with - a list of objects. 但是由于某种原因,它会返回与我刚开始时完全相同的东西-对象列表。 Even if I expand it to this:
即使我将其扩展为:
_(cpuInfo).each(function(item) { return _(item).values() })
It still returns just the list of objects. 它仍然仅返回对象列表。
What am I doing wrong? 我究竟做错了什么?
var res = _.map(cpuInfo, function (el) {
return _.values(el)
})
res = _.flatten(res)
console.log(res);
Demo: http://jsbin.com/rodipu/1/edit?js,console 演示: http : //jsbin.com/rodipu/1/edit?js,console
In pure JavaScript 用纯JavaScript
temp = [];
cpuInfo.forEach(function(obj){
Object.keys(obj).forEach(function(k){
temp.push(obj[k]);
});
});
Ref - Object.keys()
, Array.prototype.forEach()
引用
Object.keys()
, Array.prototype.forEach()
Note - both functions compatible with >IE8 注意- 两种功能均与> IE8兼容
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