I have an array of months (var months), and I am trying to filter out and get the months that the array of object (var array1) does not have and add empty value of property Avg
var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
var array1 = [{Month: 'Jan', Avg: 10},{Month: 'Feb', Avg: 20},
{Month: 'May', Avg: 50},{Month: 'Jun', Avg: 60}];`
Eg. array1 has the property value of Month: Jan, Feb, May and Jun, but I want to get the months that are missing and add value of 0 to property Avg like {Month: 'Mar', Avg: 0}, {Month: 'Apr', Avg: 0}, ... for the missing months comparing it with months array
Expected result of array1:
[{Month: 'Jan', Avg: 10}, {Month: 'Feb', Avg: 20},
{Month: 'Mar', Avg: 0}, {Month: 'Apr', Avg: 0},
{Month: 'May', Avg: 50}, {Month: 'Jun', Avg: 60},
{Month: 'Jul', Avg: 0}, {Month: 'Aug', Avg: 0},
{Month: 'Sep', Avg: 0}, {Month: 'Oct', Avg: 0},
{Month: 'Nov', Avg: 0}, {Month: 'Dec', Avg: 0}];
Use Array.map with Array.find
const months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
const array1 = [{Month: 'Jan', Avg: 10},{Month: 'Feb', Avg: 20},
{Month: 'May', Avg: 50},{Month: 'Jun', Avg: 60}];
const result = months.map(m => array1.find(a => a.Month === m)??{Month: m, Avg: 0});
console.log(result);I think this should work pretty much!
var months = [
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec",
];
var array1 = [{
Month: "Jan",
Avg: 10
},
{
Month: "Feb",
Avg: 20
},
{
Month: "May",
Avg: 50
},
{
Month: "Jun",
Avg: 60
},
];
let finalArr = [];
months.filter((e) => {
let index = array1.findIndex((ele) => ele.Month == e);
if (index >= 0) {
finalArr.push(array1[index]);
} else {
finalArr.push({
Month: e,
Avg: 0
});
}
});
console.log(finalArr);