Ramda: get objects from array by comparing with each item in another array

Question

I\'ve an array like:

ids = [1,3,5];

and another array like:

items: [
{id: 1, name: \'a\'}, 
{id: 2, name: \'b\'}, 
{id: 3,          


        

Answer 1

I suggest to use a hash table for faster lookup.

var ids = [1, 3, 5],
    items = [{id: 1, name: 'a'}, {id: 2, name: 'b'}, {id: 3, name: 'c'}, {id: 4, name: 'd'}, {id: 5, name: 'e'}, {id: 6, name: 'f'} ],
    filtered = items.filter(function(obj) {
        return this[obj.id];
    }, ids.reduce(function (r, a) {
        r[a] = true;
        return r;
    }, Object.create(null)));

document.write('
' + JSON.stringify(filtered, 0, 4) + '
');