将对象数组转换为字符串数组

Question

I have an Object array that looks like the following:

var array = [
  {'id':1,'description':test},
  {'id':2,'description':test},
  {'id':3,'description':test}
]

And I want to convert it to look like this:

var newArray = [
  1, 2, 3
]

So it's basically taking the object array, extracting the id 's out of the objects, and creating a new array that contains the id 's that were extracted. Is there a way to do this in one line? Even better if a new array doesn't have to get created and array is just updated.

Answer 1

 var test ="sai"; var array = [ {'id':1,'description':test}, {'id':2,'description':test}, {'id':3,'description':test} ] console.log(array.map(function(obj){return obj.id})) 

Answer 2

iterate the array using foreach and populate newArray

var newArray = [];
array.forEach(funtion(element){
   newArray.push(element.id);
});
console.log( newArray );

Answer 3

array.map(function(element) {return element.id})

OP要求：如果只是更新数组会更好

array = array.map(function(element) {return element.id})

Answer 4

array.map(function (item) { 
    return item["id"];
}

If you'd like to have anew instance of the mapped array:

var newarray = [];
array.forEach(function (item) {
    newarray.push(item["id"]);
}