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* @license Apache-2.0
*
* Copyright (c) 2025 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 isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
var accessorGetter = require( '@stdlib/array/base/accessor-getter' );
var getter = require( '@stdlib/array/base/getter' );
var dtype = require( '@stdlib/array/dtype' );
// MAIN //
/**
* Tests if an array is sorted in ascending order.
*
* @param {Collection} x - input array
* @returns {boolean} boolean indicating if an array is sorted in ascending order
*
* @example
* var out = isSortedAscending( [ 1, 2, 3 ] );
* // returns true
*
* @example
* var out = isSortedAscending( [ 3, 2, 1 ] );
* // returns false
*
* @example
* var out = isSortedAscending( [ 3, 3, 3 ] );
* // returns true
*
* @example
* var out = isSortedAscending( [ 3 ] );
* // returns true
*
* @example
* var out = isSortedAscending( [] );
* // returns false
*
* @example
* var out = isSortedAscending( [ 1, 3, 2 ] );
* // returns false
*/
function isSortedAscending( x ) {
var len;
var get;
var dt;
var v1;
var v2;
var i;
// Resolve the input array data type:
dt = dtype( x );
// Resolve an accessor for retrieving input array elements:
if ( isAccessorArray( x ) ) {
get = accessorGetter( dt );
} else {
get = getter( dt );
}
// Get the number of elements over which to iterate:
len = x.length;
// Check for an empty array:
if ( len === 0 ) {
return false;
}
// Loop over the elements...
v1 = get( x, 0 );
for ( i = 1; i < len; i++ ) {
v2 = get( x, i );
if ( v1 > v2 ) {
return false;
}
v1 = v2;
}
return true;
}
// EXPORTS //
module.exports = isSortedAscending;
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