I try to remove duplicates from this array
let arr = [{id: "2023010600157"},{id: "2023010600158"},{id: "2023010600157"},{id: "2023010600158"}]
After I used reduce(), I found that after the first loop, the change of the prev was unexpected
enter image description here
Why does prev become the whole array after the first loop?
code here
let arr = [{ id: "2023010600157" },{ id: "2023010600158" },{ id: "2023010600157" },{ id: "2023010600158" } ]
let res = arr.reduce((prev, curr, index) => {
console.warn('loop No ${index + 1}')
console.log(prev);
console.log(curr, 'curr');
if (curr.id !== prev.id) {
prev.push(curr)
}
console.log(prev, 'prev');
return prev
},[])
console.log(res);
i tried to read log ,but i failed.
