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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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isStringArray = require( '@stdlib/assert/is-string-array' ).primitives;
var indexOf = require( '@stdlib/utils/index-of' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a partial object copy excluding specified keys.
*
* @param {Object} obj - source object
* @param {(string|StringArray)} keys - keys to exclude
* @throws {TypeError} first argument must be an object
* @throws {TypeError} second argument must be either a string or an array of strings
* @returns {Object} new object
*
* @example
* var obj1 = {
* 'a': 1,
* 'b': 2
* };
*
* var obj2 = omit( obj1, 'b' );
* // returns { 'a': 1 }
*/
function omit( obj, keys ) {
var ownKeys;
var out;
var key;
var i;
if ( typeof obj !== 'object' || obj === null ) {
throw new TypeError( format( 'invalid argument. First argument must be an object. Value: `%s`.', obj ) );
}
ownKeys = objectKeys( obj );
out = {};
if ( isString( keys ) ) {
for ( i = 0; i < ownKeys.length; i++ ) {
key = ownKeys[ i ];
if ( key !== keys ) {
out[ key ] = obj[ key ];
}
}
return out;
}
if ( isStringArray( keys ) ) {
for ( i = 0; i < ownKeys.length; i++ ) {
key = ownKeys[ i ];
if ( indexOf( keys, key ) === -1 ) {
out[ key ] = obj[ key ];
}
}
return out;
}
throw new TypeError( format( 'invalid argument. Second argument must be either a string or an array of strings. Value: `%s`.', keys ) );
}
// EXPORTS //
module.exports = omit;
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