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* @license Apache-2.0
*
* Copyright (c) 2021 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 keysIn = require( '@stdlib/utils/keys-in' );
var hasProp = require( '@stdlib/assert/has-property' );
// MAIN //
/**
* Returns the common own and inherited property names of two or more objects.
*
* @param {*} obj1 - first object
* @param {*} obj2 - second object
* @param {...*} [obj] - additional objects
* @throws {Error} must provide at least two objects
* @returns {(StringArray|EmptyArray)} common keys
*
* @example
* var obj = {
* 'a': 1,
* 'b': 2,
* 'c': 3
* };
*
* var obj2 = {
* 'a': 1,
* 'b': 2
* };
*
* var keys = commonKeysIn( obj, obj2 );
* // returns [ 'a', 'b' ]
*
* @example
* var obj1 = {
* 'a': 1,
* 'b': 2,
* 'c': 3
* };
*
* var obj2 = {
* 'a': 1,
* 'b': 2
* };
*
* var obj3 = {
* 'a': 1,
* };
*
* var keys = commonKeysIn( obj1, obj2, obj3 );
* // returns [ 'a' ]
*/
function commonKeysIn() {
var nargs;
var keys;
var arg;
var ptr;
var N;
var i;
var j;
nargs = arguments.length;
if ( nargs < 2 ) {
throw new Error( 'insufficient arguments. Must provide at least two objects.' );
}
keys = keysIn( arguments[ 0 ] );
N = keys.length;
for ( i = 1; i < nargs; i++ ) {
arg = arguments[ i ];
ptr = 0;
for ( j = 0; j < N; j++ ) {
if ( hasProp( arg, keys[ j ] ) ) {
keys[ ptr ] = keys[ j ];
ptr += 1;
}
}
N = ptr;
}
keys.length = N;
return keys;
}
// EXPORTS //
module.exports = commonKeysIn;
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