I have a list look like:

const initArray = [
  {
    id: 0,
  },
  {
    id: 1,
  },
  {
    id: 2,
  },
  {
    id: 3,
  },
];

A selected list look like:

const selectedList = [
  {
    id: 2,
  },
];

And the desired data has been sorted:

const outPut= [
  {
    id: 2,
  },
  {
    id: 0,
  },
  {
    id: 1,
  },
  {
    id: 3,
  },
];

I'm in trouble right now, so I can't figure it out yet.

Can you share some solutions?

CodePudding user response：

You could take an object which keeps the order of the first objects and sort the rest after.

const
    data = [{ id: 0 }, { id: 1 }, { id: 2 }, { id: 3 }],
    selectedList = [{ id: 2 }],
    order = Object.fromEntries(selectedList.map(({ id }, i) => [id, i   1]));

data.sort((a, b) => (order[a.id] || Number.MAX_VALUE) - (order[b.id] || Number.MAX_VALUE));

console.log(data);

CodePudding user response：

• Using Set and Array#map, get set of ids to prioritize
• Using Array#sort, sort the items using the above set

const _sort = (arr = [], selected = []) => {
  const priority = new Set( selected.map(({ id }) => id) );
  return [...arr].sort(({ id: a }, { id: b }) => priority.has(b) - priority.has(a));
}

const 
  initArray = [ { id: 0 }, { id: 1 }, { id: 2 }, { id: 3 } ],
  selectedList = [ { id: 2 } ];
console.log( _sort(initArray, selectedList) );