我需要帮助转换使用ramda的对象数组;我想使用ramda组的属性和总和结果在指定的属性
- 组由一个指定的属性
- 总和在 另一个属性所得设置
给定的阵列是这样的:
var arr = [
{
title: "scotty",
age: 22,
score: 54,
hobby: "debugging"
}, {
title: "scotty",
age: 22,
score: 19,
hobby: "debugging"
}
, {
title: "gabriel",
age: 40,
score: 1000
}
];
如果我想组title
和总和age
它应返回以下值的摘要
var arr = [
{
title: "scotty",
age: 44,
hobby: "debugging",
}
, {
title: "gabriel",
age: 40,
score: 1000
}
];
当未指定的属性的值不同时,应该省略它们,但如果未指定的属性值相同,则应保留在最终结果中。
**我的解决办法**
/*
* [Student]
*/
var arr = [
{
title: "scotty",
age: 22,
score: 54,
hobby: "debugging"
}, {
title: "scotty",
age: 22,
score: 19,
hobby: "debugging"
}
, {
title: "gabriel",
age: 40,
score: 1000
}
];
/*
* String -> [[Student]] -> [Student]
*/
var sumOnProperty = function(property, v){
var sum = (x,y) => x[property] + y[property];
var new_array = [];
v.forEach(arr => {
if(arr.length > 1){
arr[0]["age"] = arr.reduce(sum)
new_array.push(arr[0]);
} else {
if(arr.length != 0){
new_array.push(arr[0]);
}
}
})
return new_array;
}
/*
* String -> String -> [Student] -> [Student]
*/
var groupsumBy = function(groupproperty, sumproperty, arr){
// create grouping
var grouping = R.groupBy(R.prop(groupproperty), arr)
// convert grouping object to array
var result1 = R.valuesIn(grouping);
// sum each grouping and flatten 2d array
var result2 = sumOnProperty(sumproperty, result1);
return result2;
}
groupsumBy("title","age",arr);
我在我的问题中提出了一个解决方案,但会很高兴看到你将如何完成它 –