search(){
    ajax_call("get_top_tracks");
}

search(){
    ajax_call2("artist.gettoptracks", "toptracks")
}

ajax_call(method){
        const methods = {
                            "get_top_tracks" : {
                                                method: "artist.gettoptracks",
                                                data:   "toptracks"
                                            },
                            "get_similar" : {
                                                method: "artist.similar",
                                                data:   "artist"
                                            },
        const url = `http://ws.audioscrobbler.com/2.0/?method=methods[method]["method"]&artist=${this.state.query}&limit=10&api_key=${LAST_FM_API_KEY}&format=json`;
        fetch(url)
        .then(response => response.json())
        .then(data => this.props.getResponse(data[methods[method]["data"]]))
        .catch(err => alert(err));
}

ajax_call2(method, data){
        const url = `http://ws.audioscrobbler.com/2.0/?method=${method}&artist=${this.state.query}&limit=10&api_key=${LAST_FM_API_KEY}&format=json`;
        fetch(url)
        .then(response => response.json())
        .then(data => this.props.getResponse(data[${data}]))
        .catch(err => alert(err));
}