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Viewing file:     comparearrays.js (1.68 KB)      -rwxrwxr-x

/**
 * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @module utils/comparearrays
 */

/**
 * Compares how given arrays relate to each other. One array can be: same as another array, prefix of another array
 * or completely different. If arrays are different, first index at which they differ is returned. Otherwise,
 * a flag specifying the relation is returned. Flags are negative numbers, so whenever a number >= 0 is returned
 * it means that arrays differ.
 *
 *		compareArrays( [ 0, 2 ], [ 0, 2 ] );		// 'same'
 *		compareArrays( [ 0, 2 ], [ 0, 2, 1 ] );		// 'prefix'
 *		compareArrays( [ 0, 2 ], [ 0 ] );			// 'extension'
 *		compareArrays( [ 0, 2 ], [ 1, 2 ] );		// 0
 *		compareArrays( [ 0, 2 ], [ 0, 1 ] );		// 1
 *
 * @param {Array} a Array that is compared.
 * @param {Array} b Array to compare with.
 * @returns {module:utils/comparearrays~ArrayRelation} How array `a` is related to `b`.
 */
export default function compareArrays( a, b ) {
	const minLen = Math.min( a.length, b.length );

	for ( let i = 0; i < minLen; i++ ) {
		if ( a[ i ] != b[ i ] ) {
			// The arrays are different.
			return i;
		}
	}

	// Both arrays were same at all points.
	if ( a.length == b.length ) {
		// If their length is also same, they are the same.
		return 'same';
	} else if ( a.length < b.length ) {
		// Compared array is shorter so it is a prefix of the other array.
		return 'prefix';
	} else {
		// Compared array is longer so it is an extension of the other array.
		return 'extension';
	}
}

/**
 * @typedef {'extension'|'same'|'prefix'} module:utils/comparearrays~ArrayRelation
 */