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* @license Apache-2.0
*
* Copyright (c) 2020 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 Int32Array = require( '@stdlib/array/int32' );
// FUNCTIONS //
/**
* Returns a comparison result. If `-1`, `a` comes before `b`. If `1`, `b` comes before `a`. If `0`, the order stays the same.
*
* @private
* @param {number} a - first number
* @param {number} b - second number
* @returns {boolean} comparison result
*/
function ascending( a, b ) {
if ( a < b ) {
return -1;
}
if ( a > b ) {
return 1;
}
return 0;
}
/**
* Returns a comparison result. If `-1`, `a` comes before `b`. If `1`, `b` comes before `a`. If `0`, the order stays the same.
*
* @private
* @param {number} a - first number
* @param {number} b - second number
* @returns {boolean} comparison result
*/
function descending( a, b ) {
if ( a < b ) {
return 1;
}
if ( a > b ) {
return -1;
}
return 0;
}
// MAIN //
/**
* Returns a permutation which rearranges input array.
*
* @private
* @param {ArrayLike} x - input array-like object
* @param {boolean} invert - controls whether to permutation that sorts input array in descending order
* @returns {Array} permutation array
*/
function order( x, invert ) {
var comparator;
var arr;
var i;
comparator = ( invert ) ? descending : ascending;
arr = new Int32Array( x.length );
for ( i = 0; i < x.length; i++ ) {
arr[ i ] = i;
}
return arr.sort( compare );
/**
* Compare the elements of the input array.
*
* @private
* @param {number} a - first number
* @param {number} b - second number
* @returns {boolean} comparison result
*/
function compare( a, b ) {
return comparator( x[a], x[b] );
}
}
// EXPORTS //
module.exports = order;
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