Js push value to object array

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)"]
};

Nick Parsons · Accepted Answer · 2019-03-11 04:31:24Z

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);

edited Mar 11, 2019 at 4:31

answered Mar 11, 2019 at 3:39

Nick Parsons

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6 Comments

Shidersz Over a year ago

Note that he wanted to change original object, maybe you should provide an alternative example: obj.datasets.data = countries.map(...) and obj.labels = countries.map(...). Anyway +1!

Elite user Over a year ago

what if i want to combined new port value to country object in brackets?

Nick Parsons Over a year ago

@Eliteuser I don't really understand your question. Pease edit your question (leaving the original untouched) with your updated question, providing the expected output.

Nick Parsons Over a year ago

@Shidersz thanks, I decided to change my original answer :)

Elite user Over a year ago

@NickParsons sorry about that. i was just thinking what is i want to 'PORT' value to be displayed in front of in new array like this labels: ["AUSTRALIA (MY)","CAMBODIA (MY)","CHINA (DE)","HONG KONG (DE)","INDONESIA (MY)"]

|

holydragon · Accepted Answer · 2019-03-11 03:39:34Z

0

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)

answered Mar 11, 2019 at 3:39

holydragon

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