gistfile1.txt

import { Alert } from "react-native";
import { Audio } from "expo";

export default class MusicPlayer {

    // Current item index
    index = 0;

    constructor(list, initialState = { speed: 1, autoPlay: true }) {
        // Create new object from Expo.Audio.Sound
        this.soundObject = new Audio.Sound();

        // Set speed value
        this.speed = initialState.speed;

        this.list = list;
    }

    /**
     * Start or stop audio.
     * @param {number} index - Index of playing item.
     * @param {boolean} playing - Is audio playing now or no.
     * @return {Promise}
     */
    startPlay = async (index = this.index, playing = false) => {
        const path = this.list[index].path;
        this.index = index;

        // Checking if now playing music, if yes stop that
        if(playing) {
            await this.soundObject.stopAsync();
        } else {
            // Checking if item already loaded, if yes just play, else load music before play
            if(this.soundObject._loaded) {
                await this.soundObject.playAsync();
            } else {
                await this.soundObject.loadAsync(path);
                await this.soundObject.playAsync();
            }
        }
    };

}