$ npm i lodash import _ from 'lodash_.uniq([1,1,2]) 배열 원소 중복 제거 -> [1,2] 반환const usersC = userA.concat(usersB) + console.log(_.uniqBy(usersC, 'userId'))console.log(_.unionBy(userA, userB, 'userId'))const foundUser = _.find(users, { name: 'Loopy' }) const foundUserIndex = _.findIndex(users, { name: 'Loopy' })_.remove(users, { name: 'Loopy' })