I have this array arr = [{id:1},{id:2},{id:3},{id:5},{id:5}]
I want to modify array like index 0 - 1 is first, 2 -3 is second, 4 - 5 is third and so on
Result array:
[first:[{id:1},{id:2}],second:[{id:3},{id:5}],third:[{id:5}]]
How can I modify array in such type?
The result you are expecting is not a valid array.
[first: [{},{}]]
It should be either an array like this
[[{},{}],[{},{}]]
or an object
{"first":[{},{}],"second":[{},{}]}
The code below converts your input to an array, it can be easily modified to an object if that's what you are looking for with some small modifications.
const arr = [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 5 }, { id: 5 }];
let result = arr.reduce((acc, current, index) => {
if (index % 2 == 0) {
acc.push([current]);
} else {
acc[Math.floor(index / 2)].push(current);
}
return acc;
}, []);
You can use array.prototype.map. This example returns the id value of each multiplied by the number it exists in the array.
let arr = [{id:1},{id:2},{id:3},{id:5},{id:5}];
arr.map(function(item,index) {
return item.id * index;
})
Try it out!
