基本编程 - 多维对象的对象数组

Question

I've been stuck on this for hours.

I have a list of objects:

const myCompanyList = [
    {name: 'coca-cola', size: 'big', color: 'red'},
    {name: 'my-cola', size: 'small', color: 'purple'},
    {name: 'pepsi', size: 'big', color: 'blue'}
];

I need to get it into this format:

myJson = {
    companies: {
        big: {
            coca-cola: {color: 'red'},
            pepsi: {color: 'blue'}
        },
        small: {
            my-cola: {color: 'purple'}
        }
    }
}

I've tried doing this:

wrapperObject = {};
innerObject = {};

for each object in myCompanyList {
    innerObject[object.size] = { object.name : {color: object.color}}

}

but the object[name] bit overwrites. How can I write this so I can dynamically get names on each object/map level? Do I need to make another inner object/map to dynamically write the names?

I've tried writing this in Java but I ended up with 5 dimensional maps and it didn't work, so I just wondered if there was something simple I'm missing - answers in Java, javascript or pseudocode thanks.

Answer 1

You can use Array.reduce() to create a map, Try the following :

 let myCompanyList = [{name: "coca-cola", size: "big", color: "red"}, {name: "my-cola", size: "small", color: "purple"},{name: "pepsi", size: "big", color:"blue"}]; let result = {}; result.companies = myCompanyList.reduce((a,curr)=>{ a[curr.size] = a[curr.size] || {}; a[curr.size][curr.name] = {"color" : curr.color}; return a; },{}); console.log(result);