javascript 如何将字典数组整理成数组字典？
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时间：2020-10-26 00:11:14 来源:igfitidea点击:
how to collate an array of dictionaries into a dictionary of arrays?
提问by Terrence Brannon
I have this data:
我有这个数据：
list = [
{name:'apple', category: "fruit", price: 1.22 },
{name:'pear', category: "fruit", price: 2.22 },
{name:'coke', category: "drink", price: 3.33 },
{name:'sprite', category: "drink", price: .44 },
];
And I'd like to create a dictionary keyed on category, whose value is an array that contains all the products of that category. My attempt to do this failed:
我想创建一个以类别为键的字典，其值是一个包含该类别所有产品的数组。我尝试这样做失败了：
var tmp = {};
list.forEach(function(product) {
var idx = product.category ;
push tmp[idx], product;
});
tmp;
采纳答案by Jiri Kriz
function dictionary(list) {
var map = {};
for (var i = 0; i < list.length; ++i) {
var category = list[i].category;
if (!map[category])
map[category] = [];
map[category].push(list[i].name); // add product names only
// map[category].push(list[i]); // add complete products
}
return map;
}
var d = dictionary(list); // call
You can test it on jsfiddle.
