JavaScript。如何通过数组函数更改对象中的某些数据？

Question

也许有人知道如何通过数组函数更改对象中的某些数据？

比如我有一个对象:

var nodes = [
  { topic: "Games",    topicscore: 100},
  { topic: "Fun",      topicscore: 550},
  { topic: "New York", topicscore: 7799},
  { topic: "Hillary",  topicscore: 745},
  { topic: "Politics", topicscore: 512},
  { topic: "Trump",    topicscore: 71}
];

我有一个函数:

var filterScoreValues = function(array_input){
  var a_out = [];
  array_input.forEach(function(x){
    a_out.push(Math.ceil(x / Math.max.apply(null,array_input) * 10) + 5)
  });
  return a_out;
};

如何将此算法应用到对象的 topicscore？

我写了这个，但我想要一个“漂亮”的变体，可能是通过 lodash 或类似的:

function filterScoreValues(input){
  var array = input.map(function (i) {
    return i.topicscore;
  });

  array.forEach(function(x, index){
    input[index]['topicscore'] = Math.ceil(x / Math.max.apply(null, array) * 10) + 5;
  });

  return input;
 };

我经常在我的变体上使用循环.. :(

Answer 1

how to change some data in an object via a function

使用以下优化方法(没有函数。如果需要多次调用该函数，可以将其包装到函数中):

var nodes = [
  { topic: "Games",    topicscore: 100},
  { topic: "Fun",      topicscore: 550},
  { topic: "New York", topicscore: 7799},
  { topic: "Hillary",  topicscore: 745},
  { topic: "Politics", topicscore: 512},
  { topic: "Trump",    topicscore: 71}
];

// taking max 'topicscore' at once
var max_score = Math.max.apply(null, nodes.map(function (o) {
    return o.topicscore;    
}));
// processing each 'topicscore' item in place(without creating temporary arrays)
nodes.forEach(function (o) {
    o.topicscore = Math.ceil(o.topicscore / max_score * 10) + 5;
});

console.log(nodes);