JS将值推送到对象数组

Question

i have the following object array

 datasets: [{
    data: [],
    backgroundColor: [
        "#FF6384",
        "#4BC0C0",
        "#FFCE56",
        "#E7E9ED",
        "#36A2EB"
    ],
    label: 'My dataset' // for legend
}],
labels: []
};

and i have another object array like bellow

[
{
"PORT": "MY",
"Country Name": "AUSTRALIA",
"nocontainers": "1017"
},
{
"PORT": "MY"
"Country Name": "CAMBODIA",
"nocontainers": "1"
},
{
"PORT": "DE"
"Country Name": "CHINA",
"nocontainers": "13846"
},
{
"PORT": "DE"
"Country Name": "HONG KONG",
"nocontainers": "252"
},
{
"PORT": "MY"
"Country Name": "INDONESIA",
"nocontainers": "208"
}

what i want to is to push all the value from 'nocontainers' to 'data' key and value from 'Country Name' to 'labels' key in first array.

i have tried array.push but didn't work, my final array should look like bellow

 datasets: [{
    data: [1017, 1, 13846, 252, 208],
    backgroundColor: [
        "#FF6384",
        "#4BC0C0",
        "#FFCE56",
        "#E7E9ED",
        "#36A2EB"
    ],
    label: 'My dataset' // for legend
}],
labels: ["AUSTRALIA (MY)","CAMBODIA (MY)","CHINA (DE)","HONG KONG (DE)","INDONESIA (MY)"]
};

Answer 1

You can create your object using .map with destructuring assignment to pull out the required properties from your countries object.

See working example below:

 const countries = [{PORT:"MY","Country Name":"AUSTRALIA",nocontainers:"1017"},{PORT:"MY","Country Name":"CAMBODIA",nocontainers:"1"},{PORT:"DE","Country Name":"CHINA",nocontainers:"13846"},{PORT:"DE","Country Name":"HONG KONG",nocontainers:"252"},{PORT:"MY","Country Name":"INDONESIA",nocontainers:"208"}]; const obj = { datasets: { data: [], backgroundColor: ["#FF6384", "#4BC0C0", "#FFCE56", "#E7E9ED", "#36A2EB"], label: 'My dataset' }, labels: [] }; obj.datasets.data = countries.map(({nocontainers: nc}) => +nc); obj.labels = countries.map(({"Country Name": cn, PORT: p}) => `${cn} (${p})`); console.log(obj); 

Answer 2

 let data = { datasets: { data: [], backgroundColor: [ "#FF6384", "#4BC0C0", "#FFCE56", "#E7E9ED", "#36A2EB" ], label: 'My dataset' // for legend }, labels: [] } let arr = [{ "Country Name": "AUSTRALIA", "nocontainers": "1017" }, { "Country Name": "CAMBODIA", "nocontainers": "1" }, { "Country Name": "CHINA", "nocontainers": "13846" }, { "Country Name": "HONG KONG", "nocontainers": "252" }, { "Country Name": "INDONESIA", "nocontainers": "208" } ] arr.forEach(a => { data.datasets.data.push(a['nocontainers']) data.labels.push(a['Country Name']) }) console.log(data)