从对象数组返回属性的子集

Question

I have an array of objects like

var array = [{date:'01/01/2017',value1:200,value2:300,value3:400}]

I am trying to get a subset of the object properties like var

var newArray = [['01/01/2017',200],['01/01/2017',200],['01/01/2017',200]......]

I do not want an array like this

[[date:'',value2:],[date:'',value2:],[date:'',value13:]]

But just directly a 2 D array from array of objects.

Currently I am doing a for each on my array of objects and pushing the required properties in to an array an returning that array.

I was looking for map function may be if that can work but this does not work with map

array.map(function(item){ 
return {
      item.date, item.value1
       }
});

Kindly suggest if there is any other function to do this without looping over?

Thanks

Answer 1

You should use map for this, you were almost there. This will sort you out:

array.map(function(item){ return [item.date,item.value1]});

Answer 2

You need to put the values in an array & map method will do rest of the work

 var array = [{ date: '01/01/2017', value1: 200, value2: 300, value3: 400 }, { date: '01/01/3017', value1: 500, value2: 300, value3: 400 }]; var m = array.map(function(item) { return [item.date, item.value1] }) console.log(m) 

 [['01/01/2017',200],['01/01/2017',200]]