[Solved] How can group multi data array to 1 array

by


This is quite obviously. No need stupid loops. Here you go:

var data = [
    {
        time: 1,
        country:
        [
            { country_code: 'US', order_count: 11 },
            { country_code: 'CN', order_count: 21 },
            { country_code: 'VN', order_count: 31 }
        ]
    },
    {
        time: 2,
        country:
        [
            { country_code: 'US', order_count: 12 },
            { country_code: 'CN', order_count: 22 },
            { country_code: 'VN', order_count: 32 }
        ]
    },
    {
        time: 3,
        country:
        [
            { country_code: 'US', order_count: 13 },
            { country_code: 'CN', order_count: 23 },
            { country_code: 'VN', order_count: 33 }
        ]
    }
]

// suppose data[0] contains all country codes
const all_country_codes = (data) => 
    data[0].country.map(c => c.country_code); 

const get_order_count = (data, code) => 
    data.country.filter(d => d.country_code == code)[0].order_count;

const get_all_order_counts = (data, code) => 
    data.map(d => get_order_count(d, code))

const make_node = (data, code) => 
    ({ country_code:code, data:get_all_order_counts(data, code) })

const output = (data) => 
    all_country_codes(data).map(code => make_node(data, code));

console.log(output(data));

Output:

[
  { country_code: 'US', data: [ 11, 12, 13 ] },
  { country_code: 'CN', data: [ 21, 22, 23 ] },
  { country_code: 'VN', data: [ 31, 32, 33 ] }
]

solved How can group multi data array to 1 array