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* @license Apache-2.0
*
* Copyright (c) 2023 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/assert/is-accessor-array' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
// FUNCTIONS //
/**
* Tests whether an object has a specified method.
*
* @private
* @param {Object} obj - input object
* @param {string} method - method name
* @returns {boolean} boolean indicating whether an object has a specified method
*
* @example
* var bool = hasMethod( [], 'lastIndexOf' );
* // returns true
*
* @example
* var bool = hasMethod( [], 'beep' );
* // returns false
*/
function hasMethod( obj, method ) {
return ( typeof obj[ method ] === 'function' );
}
/**
* Returns the index of the last element which equals a provided search element.
*
* @private
* @param {Collection} x - input array
* @param {*} searchElement - search element
* @param {NonNegativeInteger} fromIndex - starting index (inclusive)
* @returns {integer} index
*
* @example
* var x = [ 1, 2, 3, 4 ];
*
* var idx = internal( x, 2, 3 );
* // returns 1
*/
function internal( x, searchElement, fromIndex ) {
var i;
for ( i = fromIndex; i >= 0; i-- ) {
if ( searchElement === x[ i ] ) {
return i;
}
}
return -1;
}
/**
* Returns the index of the last element which equals a provided search element.
*
* @private
* @param {Object} x - input array object
* @param {*} searchElement - search element
* @param {NonNegativeInteger} fromIndex - starting index (inclusive)
* @returns {integer} index
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
*
* var x = toAccessorArray( [ 1, 2, 3, 4 ] );
*
* var idx = accessors( x, 2, 3 );
* // returns 1
*/
function accessors( x, searchElement, fromIndex ) {
var get;
var i;
get = resolveGetter( x );
for ( i = fromIndex; i >= 0; i-- ) {
if ( searchElement === get( x, i ) ) {
return i;
}
}
return -1;
}
// MAIN //
/**
* Returns the index of the last element which equals a provided search element.
*
* ## Notes
*
* - If unable to find an element which equals a provided search element, the function returns `-1`.
*
* @param {Collection} x - input array
* @param {*} searchElement - search element
* @param {integer} fromIndex - starting index (inclusive)
* @returns {integer} index
*
* @example
* var x = [ 1, 2, 3, 4 ];
*
* var idx = lastIndexOf( x, 2, 3 );
* // returns 1
*
* @example
* var Int32Array = require( '@stdlib/array/int32' );
*
* var x = new Int32Array( [ 1, 2, 3, 4 ] );
*
* var idx = lastIndexOf( x, 2, 3 );
* // returns 1
*/
function lastIndexOf( x, searchElement, fromIndex ) {
if ( hasMethod( x, 'lastIndexOf' ) ) {
return x.lastIndexOf( searchElement, fromIndex );
}
if ( fromIndex < 0 ) {
fromIndex += x.length;
if ( fromIndex < 0 ) {
return -1;
}
} else if ( fromIndex > x.length ) {
fromIndex = x.length - 1;
}
if ( isAccessorArray( x ) ) {
return accessors( x, searchElement, fromIndex );
}
return internal( x, searchElement, fromIndex );
}
// EXPORTS //
module.exports = lastIndexOf;
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