Question

我的json数组看起来像这样

        [
        {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"500"},
        {"hoteldetail"{"hotelid":"00007111","hotelname":"hjghghg","minrate":"1200"},
        {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"7000"},
        {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"8000"}

        ]

从此我想要获取范围为minrate

的项目

例如：如果minrate范围是（500,7500），它将返回json数组中仅包含上述范围内的minrate的项

那么如何使用lodash获得输出？

Answer 1

直接的实施是

_.filter(arr, item => _.inRange(item.hoteldetail.minrate, 500, 7501))

与读取的完全相同：对属性hoteldetail.minrate在指定范围内的项过滤数组。但是，较新的lodash有一个非常好的函数叫_.iteratee，它允许你提供一个过滤速记，例如：

_.filter(arr, 'minrate in range 500, 7500')

这是实施

_.iteratee = _.wrap(_.iteratee, function(callback, func) {
  var p = /minrate in range (\d+), (\d+)/g.exec(func);
  return !p ? callback(func) : function(object) {
    return object.hoteldetail.minrate >= p[1] && object.hoteldetail.minrate <= p[2];
  };
});

您可以像编写英语_.filter(arr, 'minrate in range 100, 200')，_.filter(arr, 'minrate in range 5000, 6000')等一样使用此迭代。您甚至可以通过以下方式推广minrate：

_.iteratee = _.wrap(_.iteratee, function(callback, func) {
  var p = /(minrate|number\ of\ rooms) in range (\d+), (\d+)/g.exec(func);
  return !p ? callback(func) : function(object) {
    var prop = object.hoteldetail[p[1]];
    return prop >= p[2] && prop <= p[3];
  };
});

并将其用作_.filter(arr, 'number of rooms in range 1, 5')

Doc：https://lodash.com/docs#iteratee

Answer 2

var _ = require('lodash'); //lodash 4.5
var hotels = [
    {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"500"}},
    {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"1200"}},
    {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"7000"}},
    {"hoteldetail":{"hotelid":"00007111","hotelname":"hjghghg","minrate":"8000"}}
]
var filteredItems = _.filter(hotels, function(hotel){
    return _.inRange(hotel.hoteldetail.mitrate, 500, 7500);
});

在使用lodash的json数组的查询结果之间

2 个答案: