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* @license Apache-2.0
*
* Copyright (c) 2026 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 //
/**
* Copies elements from one array to another array and replaces all elements within a specified range according to a provided 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
* @param {Collection} out - output array
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @returns {Collection} output array
*
* @example
* function fcn() {
* return 5;
* }
*
* var x = [ 1, 2, 3, 4 ];
*
* var out = [ 0, 0, 0, 0 ];
* var arr = indexed( x, 1, 3, fcn, {}, out, 1, 0 );
* // returns [ 1, 5, 5, 4 ]
*
* var bool = ( arr === out );
* // returns true
*/
function indexed( x, start, end, fcn, thisArg, out, stride, offset ) {
var io;
var i;
io = offset;
for ( i = 0; i < x.length; i++ ) {
if ( i >= start && i < end ) {
out[ io ] = fcn.call( thisArg, x[ i ], i, x );
} else {
out[ io ] = x[ i ];
}
io += stride;
}
return out;
}
/**
* Copies elements from one accessor array to another accessor array and replaces all elements within a specified range according to a provided 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
* @param {Object} out - output array object
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @returns {Collection} output 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 out = toAccessorArray( [ 0, 0, 0, 0 ] );
* var arr = accessors( arraylike2object( x ), 1, 3, fcn, {}, arraylike2object( out ), 1, 0 );
*
* var v = arr.get( 1 );
* // returns 5
*/
function accessors( x, start, end, fcn, thisArg, out, stride, offset ) {
var xdata;
var odata;
var xget;
var oset;
var io;
var i;
xdata = x.data;
odata = out.data;
xget = x.accessors[ 0 ];
oset = out.accessors[ 1 ];
io = offset;
for ( i = 0; i < xdata.length; i++ ) {
if ( i >= start && i < end ) {
oset( odata, io, fcn.call( thisArg, xget( xdata, i ), i, xdata ) );
} else {
oset( odata, io, xget( xdata, i ) );
}
io += stride;
}
return odata;
}
// MAIN //
/**
* Copies elements from one array to another array and replaces all elements within a specified range according to a provided 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 {Collection} out - output array
* @param {integer} stride - output array stride
* @param {NonNegativeInteger} offset - output array offset
* @param {*} [thisArg] - callback function execution context
* @returns {Collection} output array
*
* @example
* function fcn() {
* return 5;
* }
*
* var x = [ 1, 2, 3, 4 ];
*
* var out = [ 0, 0, 0, 0 ];
* var arr = assign( x, 1, 3, fcn, out, 1, 0 );
* // returns [ 1, 5, 5, 4 ]
*
* var bool = ( arr === out );
* // returns true
*/
function assign( x, start, end, fcn, out, stride, offset, thisArg ) {
var len;
var xo;
var oo;
len = x.length;
if ( start < 0 ) {
start += len;
if ( start < 0 ) {
start = 0;
}
}
if ( end < 0 ) {
end += len; // if `end` is still negative, that is fine, as `x` will simply be copied without modification
} else if ( end > len ) {
end = len;
}
xo = arraylike2object( x );
oo = arraylike2object( out );
if ( xo.accessorProtocol || oo.accessorProtocol ) {
accessors( xo, start, end, fcn, thisArg, oo, stride, offset );
return out;
}
indexed( x, start, end, fcn, thisArg, out, stride, offset );
return out;
}
// EXPORTS //
module.exports = assign;
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