Lets say there is an array of objects
array = [{ id : 1, name : 'aaa' }, { id : 1, name: 'asd' }, id : 2, name : 'asd' ]
in a loop eg
array.forEach(a =>{ currentId = a.id }
how to check if current id is same or not as prev id
>Solution :
You can use the index to get the previous entry:
array = [{ id : 1, name : 'aaa' }, { id : 1, name: 'asd' }, {id : 2, name : 'asd'} ]
array.forEach((a, index) =>{
let currentId = a.id
// Check if previous exists (Index will be 0 on first run)
if (index) {
let previousId = array[index - 1].id
// If exists we can check it
console.log(currentId === previousId)
}
})