合并对象总结一个属性的JavaScript [英] merge object & sum a single property javascript
本文介绍了合并对象总结一个属性的JavaScript的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个像这样的数组
[
{
item_guid: "57e7a1cd6a3f3669dc03db58"
quantity:3
},
{
item_guid: "57e77b06e0566d496b51fed5"
quantity:3
},
{
item_guid: "57e7a1cd6a3f3669dc03db58"
quantity:3
},
{
item_guid: "57e77b06e0566d496b51fed5"
quantity:3
}
]
我要从中将类似的item_guid
合并为一个对象,数量如此总结
What i want from this to merge similar item_guid
into one object and quantity get summed up like this
[
{
item_guid: "57e7a1cd6a3f3669dc03db58"
quantity:6
},
{
item_guid: "57e77b06e0566d496b51fed5"
quantity:6
}
]
我知道这可以实现一些循环,相反,我正在寻找使用lodash或EcmaScript2015代码的解决方案,以使我们的生活更轻松
I know this can be achieved some loop, instead I'm looking for solutions that uses lodash or EcmaScript2015 code to make our life easier
推荐答案
一种简单的方法:
遍历数据并创建一个对象,其中键将是唯一的ID,其值将是数量.然后环回对象的键并创建对象.
Loop over data and create an object where key will be unique id and its value will be quantity. Then loop back over object's keys and create objects.
var data = [{ item_guid: "57e7a1cd6a3f3669dc03db58", quantity: 3 }, { item_guid: "57e77b06e0566d496b51fed5", quantity: 3 }, { item_guid: "57e7a1cd6a3f3669dc03db58", quantity: 3 }, { item_guid: "57e77b06e0566d496b51fed5", quantity: 3 }]
var r = {};
data.forEach(function(o){
r[o.item_guid] = (r[o.item_guid] || 0) + o.quantity;
})
var result = Object.keys(r).map(function(k){
return { item_guid: k, quantity: r[k] }
});
console.log(result)
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