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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var objectKeys = require( '@stdlib/utils/keys' );
var getPrototypeOf = require( '@stdlib/utils/get-prototype-of' );
var isDate = require( '@stdlib/assert/is-date-object' );
var isError = require( '@stdlib/assert/is-error' );
var isBuffer = require( '@stdlib/assert/is-buffer' );
var isRegExp = require( '@stdlib/assert/is-regexp' );
// MAIN //
/**
* Tests for deep equality between two values.
*
* @param {*} a - first comparison value
* @param {*} b - second comparison value
* @returns {boolean} boolean indicating if `a` is deep equal to `b`
*
* @example
* var bool = deepEqual( [ 1, 2, 3 ], [ 1, 2, 3 ] );
* // returns true
*
* @example
* var bool = deepEqual( [ 1, 2, 3 ], [ 1, 2, '3' ] );
* // returns false
*
* @example
* var bool = deepEqual( { 'a': 2 }, { 'a': [ 2 ] } );
* // returns false
*
* @example
* var bool = deepEqual( [], {} );
* // returns false
*
* @example
* var bool = deepEqual( null, null );
* // returns true
*/
function deepEqual( a, b ) {
var aKeys;
var bKeys;
var typeA;
var typeB;
var key;
var i;
typeA = typeof a;
typeB = typeof b;
if ( a === null || typeA !== 'object' ) {
if ( b === null || typeB !== 'object' ) {
return a === b;
}
return false;
}
// Case: `a` is of type 'object'
if ( typeB !== 'object' ) {
return false;
}
if ( getPrototypeOf( a ) !== getPrototypeOf( b ) ) {
return false;
}
if ( isDate( a ) ) {
return a.getTime() === b.getTime();
}
if ( isRegExp( a ) ) {
return a.source === b.source && a.flags === b.flags;
}
if ( isError( a ) ) {
if ( a.message !== b.message || a.name !== b.name ) {
return false;
}
}
if ( isBuffer( a ) ) {
if ( a.length !== b.length ) {
return false;
}
for ( i = 0; i < a.length; i++ ) {
if ( a[ i ] !== b[ i ] ) {
return false;
}
}
return true;
}
aKeys = objectKeys( a );
bKeys = objectKeys( b );
if ( aKeys.length !== bKeys.length ) {
return false;
}
aKeys.sort();
bKeys.sort();
// Cheap key test:
for ( i = 0; i < aKeys.length; i++ ) {
if ( aKeys[ i ] !== bKeys[ i ] ) {
return false;
}
}
// Possibly expensive deep equality test for each corresponding key:
for ( i = 0; i < aKeys.length; i++ ) {
key = aKeys[ i ];
if ( !deepEqual( a[ key ], b[ key ] ) ) {
return false;
}
}
return typeA === typeB;
}
// EXPORTS //
module.exports = deepEqual;
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