将对象数组转换为基元数组（从对象属性中提取）

Question

Consider the following code:

var input = [{x: 1, y: 6}, {x: 4, y: 3}, {x: 9, y: 2}];

var output = convert(input);

console.log(output); // = [1, 6, 4, 3, 9, 2]

What is the shortest, most concise convert function I can write that will give me the output shown?

So far I've come up with the following:

function convert(input) {
  var output = [];
  input.forEach(function(obj) {
    output.push(obj.x, obj.y);
  });
  return output;
}

But surely there's a nice one-liner way of doing this?

Answer 1

With Array.prototype.reduce method it will save you two lines of code:

 function convert(arr) { return arr.reduce(function(prev, curr) { return prev.concat(curr.x, curr.y); }, []); } var input = [{x: 1, y: 6}, {x: 4, y: 3}, {x: 9, y: 2}]; document.write(JSON.stringify( convert(input) ));