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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';
// MAIN //
/**
* Comparator function for sorting property names and symbols in lexicography order.
*
* ## Notes
*
* - Symbols are sorted **after** names.
*
* @private
* @param {(string|symbol)} a - property
* @param {(string|symbol)} b - property
* @returns {integer} comparison result
*/
function comparator( a, b ) {
var ta = typeof a;
var tb = typeof b;
// Strings are sorted before symbols:
if ( ta === 'string' && tb === 'symbol' ) {
return -1;
}
if ( ta === 'symbol' && tb === 'string' ) {
return 1;
}
// Convert symbols to strings:
a = String( a );
b = String( b );
// Sort in lexicographic order:
if ( a < b ) {
return -1;
}
if ( a === b ) {
return 0;
}
return 1;
}
// EXPORTS //
module.exports = comparator;
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