javascript - 数组转换嵌套对象

Question

我想转换以下数组:

 let errors = [
   {
     field: "data.time",
     message: "less length than allowed"
   },
   {
     field: "data.time",
     message: "wrong format"
   },
   {
     field: "data.age",
     message: "too young"
   },
   { 
     field: "data.age",
     message: "not enough information"
   }
];

进入:

[
  { time: "less_length_than_allowed <br> wrong_format"},
  { age: "too_young <br> not_enough_information"},
]

我基本上想删除字符串“data”。对于每个字段属性。然后合并数组，以公共(public)字段为对象键，消息串联为值。

这是我到目前为止所拥有的:

var removedData = errors.map(item => {
   item.field = item.field.slice(5);
   return item
});

var computedErrors = _.chain(removedData).groupBy('field').value();

Answer 1

您可以在纯js中使用reduce()返回以下结果。

let errors = [{
  field: "data.time",
  message: "less length than allowed"
}, {
  field: "data.time",
  message: "wrong format"
}, {
  field: "data.age",
  message: "too young"
}, {
  field: "data.age",
  message: "not enough information"
}];

var o = {}
var result = errors.reduce(function(r, e) {
  var key = e.field.split('.')[1];
  var message = e.message.replace(/\s/g, '_');

  if (!o[key]) {
    o[key] = {[key]: message}
    r.push(o[key])
  } else {
    o[key][key] += ' <br> ' + message
  }
  return r;
}, [])

console.log(result)