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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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isFunction = require( '@stdlib/assert/is-function' );
var isPlainObject = require( '@stdlib/assert/is-plain-object' );
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var ndims = require( '@stdlib/ndarray/ndims' );
var format = require( '@stdlib/string/format' );
var base = require( './base.js' ).assign;
// MAIN //
/**
* Returns the index of the last element along an ndarray dimension which passes a test implemented by a predicate function and assigns the results to a provided output ndarray.
*
* @param {ndarrayLike} x - input ndarray
* @param {ndarrayLike} out - output ndarray
* @param {Options} [options] - function options
* @param {integer} [options.dim=-1] - dimension over which to perform operation
* @param {Function} clbk - callback function
* @param {*} [thisArg] - callback execution context
* @throws {TypeError} function must be provided at least three arguments
* @throws {TypeError} first argument must be an ndarray-like object
* @throws {TypeError} second argument must be an ndarray-like object
* @throws {TypeError} callback argument must be a function
* @throws {TypeError} options argument must be an object
* @throws {RangeError} dimension index must not exceed input ndarray bounds
* @throws {RangeError} first argument must have at least one dimension
* @throws {Error} must provide valid options
* @returns {ndarray} output ndarray
*
* @example
* var zeros = require( '@stdlib/ndarray/zeros' );
* var ndarray2array = require( '@stdlib/ndarray/to-array' );
* var ndarray = require( '@stdlib/ndarray/ctor' );
*
* function isEven( v ) {
* return v % 2.0 === 0.0;
* }
*
* // Create data buffers:
* var xbuf = [ 1.0, 2.0, -3.0, 4.0, -5.0, 6.0 ];
*
* // Define the shape of the input array:
* var shape = [ 2, 3 ];
*
* // Define the array strides:
* var strides = [ 3, 1 ];
*
* // Define the index offset:
* var offset = 0;
*
* // Create an input ndarray:
* var x = new ndarray( 'generic', xbuf, shape, strides, offset, 'row-major' );
*
* // Create an output ndarray:
* var y = zeros( [ 2 ], {
* 'dtype': 'int32'
* });
*
* // Perform operation:
* var out = assign( x, y, isEven );
* // returns <ndarray>
*
* var bool = ( out === y );
* // returns true
*
* var arr = ndarray2array( out );
* // returns [ 1, 2 ]
*/
function assign( x, out ) {
var hasOptions;
var options;
var nargs;
var opts;
var ctx;
var cb;
nargs = arguments.length;
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
}
if ( !isndarrayLike( out ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an ndarray. Value: `%s`.', out ) );
}
// Initialize an options object:
opts = {
'dims': [ -1 ] // default behavior is to perform a reduction over the last dimension
};
// Initialize a flag indicating whether an `options` argument was provided:
hasOptions = false;
// Case: assign( x, out, clbk )
if ( nargs <= 3 ) {
cb = arguments[ 2 ];
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a function. Value: `%s`.', cb ) );
}
}
// Case: assign( x, out, ???, ??? )
else if ( nargs === 4 ) {
// Case: assign( x, out, clbk, thisArg )
if ( isFunction( arguments[ 2 ] ) ) {
cb = arguments[ 2 ];
ctx = arguments[ 3 ];
}
// Case: assign( x, out, options, clbk )
else {
options = arguments[ 2 ];
cb = arguments[ 3 ];
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Fourth argument must be a function. Value: `%s`.', cb ) );
}
hasOptions = true;
}
}
// Case: assign( x, out, options, clbk, thisArg )
else {
options = arguments[ 2 ];
cb = arguments[ 3 ];
ctx = arguments[ 4 ];
if ( !isFunction( cb ) ) {
throw new TypeError( format( 'invalid argument. Fourth argument must be a function. Value: `%s`.', cb ) );
}
hasOptions = true;
}
if ( hasOptions ) {
if ( !isPlainObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
// Resolve provided options...
if ( hasOwnProp( options, 'dim' ) ) {
opts.dims[ 0 ] = options.dim;
}
}
if ( ndims( x ) < 1 ) {
throw new RangeError( 'invalid argument. First argument must have at least one dimension.' );
}
return base( x, out, opts, cb, ctx );
}
// EXPORTS //
module.exports = assign;
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