gitlab-org--gitlab-foss/app/assets/javascripts/filtered_search/stores/recent_searches_store.js

import _ from 'underscore';

class RecentSearchesStore {
  constructor(initialState = {}) {
    this.state = Object.assign({
      recentSearches: [],
    }, initialState);
  }

  addRecentSearch(newSearch) {
    this.setRecentSearches([newSearch].concat(this.state.recentSearches));

    return this.state.recentSearches;
  }

  setRecentSearches(searches = []) {
    const trimmedSearches = searches.map(search => search.trim());
    this.state.recentSearches = _.uniq(trimmedSearches).slice(0, 5);
    return this.state.recentSearches;
  }
}

export default RecentSearchesStore;