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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 arraylike2object = require( '@stdlib/array/base/arraylike2object' );
// FUNCTIONS //
/**
* Fills all elements within a portion of an indexed array according to a callback function.
*
* @private
* @param {Collection} x - input array
* @param {integer} start - starting index (inclusive)
* @param {integer} end - ending index (exclusive)
* @param {Function} fcn - callback function
* @param {*} thisArg - callback function execution context
* @returns {Array} output array
*
* @example
* function fcn() {
* return 5;
* }
*
* var x = [ 1, 2, 3, 4 ];
*
* var out = indexed( x, 1, 3, fcn, {} );
* // returns [ 1, 5, 5, 4 ]
*/
function indexed( x, start, end, fcn, thisArg ) {
var i;
for ( i = start; i < end; i++ ) {
x[ i ] = fcn.call( thisArg, x[ i ], i, x );
}
return x;
}
/**
* Fills all elements within a portion of an accessor array according to a callback function.
*
* @private
* @param {Object} x - input array object
* @param {integer} start - starting index (inclusive)
* @param {integer} end - ending index (exclusive)
* @param {Function} fcn - callback function
* @param {*} thisArg - callback function execution context
* @returns {AccessorArray} modified input array
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* function fcn() {
* return 5;
* }
*
* var x = toAccessorArray( [ 1, 2, 3, 4 ] );
* var obj = arraylike2object( x );
*
* var out = accessors( obj, 1, 3, fcn, {} );
* // returns <AccessorArray>
*
* var v = x.get( 0 );
* // returns 1
*
* v = x.get( 1 );
* // returns 5
*
* v = x.get( 2 );
* // returns 5
*
* v = x.get( 3 );
* // returns 4
*/
function accessors( x, start, end, fcn, thisArg ) {
var data;
var get;
var set;
var i;
data = x.data;
get = x.accessors[ 0 ];
set = x.accessors[ 1 ];
for ( i = start; i < end; i++ ) {
set( data, i, fcn.call( thisArg, get( data, i ), i, data ) );
}
return data;
}
// MAIN //
/**
* Fills all elements within a portion of an array according to a callback function.
*
* @param {Collection} x - input array
* @param {integer} start - starting index (inclusive)
* @param {integer} end - ending index (exclusive)
* @param {Function} fcn - callback function
* @param {*} [thisArg] - callback function execution context
* @returns {Collection} output array
*
* @example
* function fcn() {
* return 5;
* }
*
* var x = [ 1, 2, 3, 4 ];
*
* var out = fillBy( x, 1, 3, fcn );
* // returns [ 1, 5, 5, 4 ]
*
* var bool = ( out === x );
* // returns true
*
* @example
* function fcn() {
* return 5;
* }
*
* var Int32Array = require( '@stdlib/array/int32' );
*
* var x = new Int32Array( [ 1, 2, 3, 4 ] );
*
* var out = fillBy( x, 1, 3, fcn );
* // returns <Int32Array>[ 1, 5, 5, 4 ]
*
* var bool = ( out === x );
* // returns true
*/
function fillBy( x, start, end, fcn, thisArg ) {
var obj;
if ( start < 0 ) {
start += x.length;
if ( start < 0 ) {
start = 0;
}
}
if ( end < 0 ) {
end += x.length; // if `end` is still negative, that is fine, as `x` will be returned un-mutated
} else if ( end > x.length ) {
end = x.length;
}
obj = arraylike2object( x );
if ( obj.accessorProtocol ) {
return accessors( obj, start, end, fcn, thisArg );
}
return indexed( x, start, end, fcn, thisArg );
}
// EXPORTS //
module.exports = fillBy;
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