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* @license Apache-2.0
*
* Copyright (c) 2019 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 contains = require( './contains.js' );
// MAIN //
/**
* Appends a value to a list if that value is not already present in the list.
*
* @private
* @param {Array} list - list to which to append
* @param {*} value - value to append
* @returns {Array} input list
*/
function appendUnique( list, value ) {
if ( contains( list.length, list, 1, 0, value ) === false ) {
list.push( value );
}
return list;
}
// EXPORTS //
module.exports = appendUnique;
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