javascript 使用 lodash 重新映射属性名称和值
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Remap properties name and values using lodash
提问by padibro
I have this array:
我有这个数组：
aItems = [{
"PropertyA": "apple",
"PropertyB": "banana",
"PropertyC": "dog",
"PropertyD": "hotdog",
"PropertyE": "coldcat",
"PropertyF": "Y",
"PropertyG": "N"
},
...,
{
"PropertyA": "this",
"PropertyB": "is",
"PropertyC": "json",
"PropertyD": "code",
"PropertyE": "wow",
"PropertyF": "N",
"PropertyG": "N"
}]
I would like use lodashto obtain this result:
我想使用lodash来获得这个结果：
aItems = [{
"propertyA": "apple",
"propertyB": "banana",
"propertyC": "dog",
"propertyD": "hotdog",
"propertyE": "coldcat",
"propertyNEW": true,
"propertyG": false
},
...,
{
"propertyA": "this",
"propertyB": "is",
"propertyC": "json",
"propertyD": "code",
"propertyE": "wow",
"propertyNEW": false,
"propertyG": false
}]
I want map each property name with other names and change the value for some specific properties. Can I do it using lodash?
我想用其他名称映射每个属性名称并更改某些特定属性的值。我可以使用lodash吗？
采纳答案by thefourtheye
Create a mapping of old and new keys, like this
创建新旧键的映射，像这样
var keyMapping = {'PropertyA': 'propertyA', ..., 'PropertyF': 'propertyNEW'}
and also a mapping of old and new values, like this
以及新旧值的映射，像这样
var valueMapping = {'Y': true, 'F': false}
And then using _.mapand _.transform, you can transform the object, like this
然后使用_.mapand _.transform，你可以转换对象，像这样
var result = _.map(allItems, function(currentObject) {
return _.transform(currentObject, function(result, value, key) {
if (key === 'PropertyF' || key === 'PropertyG') {
value = valueMapping(value);
}
result[keyMapping[key]] = value;
});
});
回答by Alexander Gonchiy
Yes, since lodash v3.8.0 you can remap objects in any way desireable
是的，从 lodash v3.8.0 开始，您可以以任何需要的方式重新映射对象
ES5 code
ES5代码
var items = [ { oldKey: 'oldValue' /*...*/ } ]
var keyMapping = { oldKey: 'newKey' /*...*/ }
var valueMapping = { oldValue: 'newValue' /*...*/ }
var remapper = function(item){
return _(item) // lodash chain start
.mapKeys( function(v, k){ return keyMapping[k] } )
.mapValues( function(v){ return valueMapping[v] } )
.value() // lodash chain end
}
var remappedItems = items.map(remapper)
ES2015/ES6 code
ES2015/ES6 代码
let items = [ { oldKey: 'oldValue' /*...*/ } ]
let keyMapping = { oldKey: 'newKey' /*...*/ }
let valueMapping = { oldValue: 'newValue' /*...*/ }
let remapper = item => _(item) // lodash chain start
.mapKeys( (v, k)=> keyMapping[k] )
.mapValues( v => valueMapping[v] )
.value() // lodash chain end
let remappedItems = items.map(remapper)
