我在合理化和聚合 javascript 中的对象数组时遇到了一些问题。
给定数组
[{"description":"Bright","size":"2XL","price":10.99},{"description":"Bright","size":"XL","price":10.99},{"description":"Bright","size":"L","price":9.99},{"group":"Foos","description":"Dull","size":"XL","price":9.99},{"description":"Dull","size":"L","price":8.99},{"description":"Dull","size":"2XL","price":9.99},{"description":"Shiny","size":"XL","price":9.99},{"description":"Shiny","size":"S","price":8.99},{"description":"Shiny","size":"3XL","price":10.3},{"description":"Shiny","size":"2XL","price":9.99}]
我正在尝试将其转换为格式为数组(此处的实际值可能有误)。
[{"descriptions":"Shiny, Bright, Dull","sizeRange":"S - L","price":8.99},{"descriptions":"Shiny, Bright, Dull","sizes":"XL - 2XL","price":9.99},{"descriptions":"Dark","sizes":"S - 2XL","price":10.99}]
也就是说 - 我希望按价格对每组商品进行分组,显示它们的描述和尺寸范围。
到目前为止,这就是我所拥有的,它似乎在工作,但它似乎非常麻烦。如果它有助于合理化代码而不是使用原生 JS,我真的很乐意使用像 lodash 或下划线这样的东西。
function groupBy (array, key) {
return array.reduce(function(value, property) {
(value[property[key]] = value[property[key]] || []).push(property);
return value;
}, {});
};
function unique(array) {
return Array.from(new Set(array));
};
function getRanges(data)
{
var result = [];
// simple map of sizes from smallest to largest to use for sorting
var sizeSort = {'S':1, 'M':2, 'L':3, 'XL':4, '2XL':5, '3XL':6, '4XL':7, '5XL':8};
// group the remaining variants by price
var group = groupBy(data, 'price');
// for each variant price group
for(var price in group) {
var item = {};
item.price = price;
// get the range of sizes sorted smallest to largest
var sizes = unique(group[price].map(function(i) {
return i.size;
})).sort(function(a, b) {
return sizeSort[a] - sizeSort[b];
});
// Add single size, or first and last size.
item.sizes = (sizes.length === 1) ?
sizes.shift() :
sizes.shift() + ' - ' + sizes.pop();
// Add the descriptions as alphabetically sorted CSV
item.description = unique(group[price].map(function(i) {
return i.description;
})).sort().join(", ");
result.push(item);
}
return result;
}
最佳答案
这是一个使用 lodash 的版本.. 我认为它看起来更理性..
function calc(data) {
var sizeSort = {'S':1, 'M':2, 'L':3, 'XL':4, '2XL':5,
'3XL':6, '4XL':7, '5XL':8};
return _.chain(data).
groupBy('price').
map(function(f){
var sizes = _.chain(f).map('size').uniq().
sortBy(function (a) { return sizeSort[a] }).value();
return {
price: _.head(f).price,
description: _.chain(f).map('description').uniq().join(',').value(),
size: sizes.length === 1 ? _.first(sizes) : _.join([_.first(sizes),_.last(sizes)], ' - ')
}
}).
sortBy(['price']).
value();
}
//put data at end, so not having to scroll down to see code
var data = [{"description":"Bright","size":"2XL","price":10.99},{"description":"Bright","size":"XL","price":10.99},{"description":"Bright","size":"L","price":9.99},{"group":"Foos","description":"Dull","size":"XL","price":9.99},{"description":"Dull","size":"L","price":8.99},{"description":"Dull","size":"2XL","price":9.99},{"description":"Shiny","size":"XL","price":9.99},{"description":"Shiny","size":"S","price":8.99},{"description":"Shiny","size":"3XL","price":10.3},{"description":"Shiny","size":"2XL","price":9.99}];
console.log(calc(data));
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.3/lodash.js"></script>
关于javascript - 对一组 javascript 对象进行分组和聚合,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39885606/