I'm trying to get a single Array with all values contained in arr1 and arr2. But I can't reach that final result.
arr1 = [
{
region: "Total",
population: 15200100,
first: 42999
}
]
arr2 = [
{
region: "Total",
second: 2939
}
]
output = [
{
region: "Total",
population: 15200100,
first: 42999
second: 2939
}
]
In one line:
const arr1 = [ { region: "Total", population: 15200100, first: 42999 } ];
const arr2 = [ { region: "Total", second: 2939 } ];
const res = arr1.map((_, index) => ({ ...arr1[index], ...arr2[index] }));
console.log(res);Try this:
const arr1 = [ { region: "Total", population: 15200100, first: 42999 } ];
const arr2 = [ { region: "Total", second: 2939 } ];
const res = [];
for(let i = 0; i < arr1.length || i < arr2.length; i++) {
const first = arr1[i] || {};
const second = arr2[i] || {};
res[i] = { ...first, ...second };
}
console.log(res);The example below returns a sum when similar keys are found.
const arr1 = [{
region: "Total",
population: 15200100,
first: 42999
}];
const arr2 = [{
region: "Total",
second: 2939
}];
const arr3 = [{
region: "Total",
population: 15200100,
first: 42999
}];
const arr4 = [{
region: "Total",
first: 3243,
second: 2939,
third: 32
}];
function test(arr1,arr2) {
let res = Array.from(arr1);
res.forEach((x) => {
arr2.forEach((y) => {
for (let key in y) {
if (typeof x[key] == 'undefined') {
x[key] = y[key];
} else {
if (key !== 'region') {
x[key] += y[key];
}
}
}
});
});
return res;
}
console.log(test(arr1,arr2));
console.log(test(arr3,arr4));
region) WILL be unique?