ckeditor/ckeditor5-utils

/**
 * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @module utils/mapsequal
 */

/**
 * Checks whether given {Map}s are equal, that is has same size and same key-value pairs.
 *
 * @param {Map} mapA The first map to compare.
 * @param {Map} mapB The second map to compare.
 * @returns {Boolean} `true` if given maps are equal, `false` otherwise.
 */
export default function mapsEqual( mapA, mapB ) {
    if ( mapA.size != mapB.size ) {
        return false;
    }

    for ( const attr of mapA.entries() ) {
        const valA = JSON.stringify( attr[ 1 ] );
        const valB = JSON.stringify( mapB.get( attr[ 0 ] ) );

        if ( valA !== valB ) {
            return false;
        }
    }

    return true;
}