Sample find method

findHelper.js

let moList = [{id: 1, name: 'NameMO-1'}, {id: 2, name: 'NameMO-2'}, {id: 3, name: 'NameMO-3'}];

let find = (() => {
    let store = {};

    return (list, id, key = 'id') => {
        if (store[id]) {
            return store[id];
        } else {
            let item = list.find(item => item[key] === id);
            return item ? (store[id] = item, store[id]) : undefined;
        }
    };
})();

find(moList, 3) // {id: 3, name: 'NameMO-3'}