Map vs. Layer with One Layer

class Example extends Phaser.Scene
{
    controls;

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.image('tiles', 'assets/tilemaps/tiles/platformer_tiles.png');
    }

    create ()
    {
        // Creating a blank tilemap with the specified dimensions
        const map = this.make.tilemap({ tileWidth: 16, tileHeight: 16, width: 18, height: 13});

        const tiles = map.addTilesetImage('tiles');

        const layer = map.createBlankLayer('layer1', tiles);
        layer.setScale(3);

        // Add a simple scene with some random element. Since there is only one layer, we can use map or
        // layer interchangeably to access tile manipulation methods.
        map.fill(58, 0, 10, map.width, 1); // Surface of the water
        layer.fill(77, 0, 11, map.width, 2); // Body of the water
        map.randomize(0, 0, 8, 10, [ 44, 45, 46, 47, 48 ]); // Left chunk of random wall tiles
        layer.randomize(8, 0, 9, 10, [ 20, 21, 22, 23, 24 ]); // Right chunk of random wall tiles
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    backgroundColor: '#00000',
    parent: 'game-container',
    pixelArt: true,
    scene: Example
};

const game = new Phaser.Game(config);