Lodash更新另一个数组Chain / Map中的元素值

Question

我如何使用Lodash使用另一个数组元素数据值更新数组元素值

var Master_Array [
{ Name: "Jon", Region: "North America & Caribbean" },
{ Name: "Ruan", Region: "Asia Pacific" }
]

var Regions_Map = [
{ Region: 'Europe', NewRegion: 'EMEA' },
{ Region: 'North America & Caribbean', NewRegion: 'NAC' },
{ Region: 'Asia Pacific', NewRegion: 'APAC' }
]

我认为可以这样做：

_.chain()
.mapValues( ...blá blá... )
.values()
.value();

预期结果：

var Master_Array [
{ Name: "Jon", Region: "NAC" },
{ Name: "Ruan", Region: "APAC" }
]

Answer 1

您不需要在迭代集合而不是对象时执行mapValues ，因此mapKeys和mapValues是迭代对象并映射到另一个对象的mapValues方法

现在，方法1，如果您想运行将返回预期项目的新数组的内容，请尝试使用这种map

var EXPECTED_RESULT = _.map(Master_Array, function(item){
    var newItem = {};
    newItem.Name = item.Name;
    newItem.Region = _.find(Regions_Map, {Region: item.Region}).NewRegion
    return newItem;
});

如果要修改现有数组，则只需通过loadash或普通javascript循环对其进行循环，然后执行操作

_.each(Master_Array,function(item){
    item.Region = _.find(Regions_Map, {Region: item.Region}).NewRegion
} )

Answer 2

使用map和find解决方案：

 var Master_Array = [ { Name: "Jon", Region: "North America & Caribbean" }, { Name: "Ruan", Region: "Asia Pacific" } ]; var Regions_Map = [ { Region: 'Europe', NewRegion: 'EMEA' }, { Region: 'North America & Caribbean', NewRegion: 'NAC' }, { Region: 'Asia Pacific', NewRegion: 'APAC' } ]; Master_Array = Master_Array.map((person) => ({ Name: person.Name, Region: Regions_Map.find((region) => region.Region === person.Region).NewRegion })); console.log(Master_Array); 

Answer 3

JavaScript解决方案

 var Master_Array = [ { Name: "Jon", Region: "North America & Caribbean" }, { Name: "Ruan", Region: "Asia Pacific" } ]; var Regions_Map = [ { Region: 'Europe', NewRegion: 'EMEA' }, { Region: 'North America & Caribbean', NewRegion: 'NAC' }, { Region: 'Asia Pacific', NewRegion: 'APAC' } ]; var result = []; Master_Array.forEach(function(data){ var temp = Regions_Map.filter(function(map){ if(map.Region === data.Region){ return map; } }); if(temp){ result.push({ Name : data.Name, NewRegion: temp[0].NewRegion }); } }); console.log(result);