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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' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
// FUNCTIONS //
/**
* Extracts property values from an input object array and assigns results to elements in an output array.
*
* @private
* @param {Array} x - input array
* @param {string} prop - property to access
* @param {Array} out - output array
* @param {integer} stride - stride length for output array
* @param {NonNegativeInteger} offset - starting index for output array
* @returns {Array} output array
*
* @example
* var x = [
* {
* 'a': 1
* },
* {
* 'a': 2
* },
* {
* 'a': 3
* }
* ];
*
* var y = [ 0, 0, 0 ];
* var out = internal( x, 'a', y, 1, 0 );
* // returns [ 1, 2, 3 ]
*
* var bool = ( out === y );
* // returns true
*/
function internal( x, prop, out, stride, offset ) {
var io;
var i;
var v;
io = offset;
for ( i = 0; i < out.length; i++ ) {
v = x[ i ];
if (
v !== void 0 &&
v !== null &&
hasOwnProp( v, prop )
) {
out[ io ] = v[ prop ];
}
io += stride;
}
return out;
}
/**
* Extracts property values from an input object array and assigns results to elements in an output array.
*
* @private
* @param {Object} x - input array object
* @param {string} prop - property to access
* @param {Object} out - output array object
* @param {integer} stride - stride length for output array
* @param {NonNegativeInteger} offset - starting index for output array
* @returns {Array} output array
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [
* {
* 'a': 1
* },
* {
* 'a': 2
* },
* {
* 'a': 3
* }
* ];
*
* var y = [ 0, 0, 0 ];
* var out = accessors( arraylike2object( toAccessorArray( x ) ), 'a', arraylike2object( toAccessorArray( y ) ), 1, 0 );
* // y => [ 1, 2, 3 ]
*/
function accessors( x, prop, out, stride, offset ) {
var xdata;
var odata;
var xget;
var oset;
var io;
var i;
var v;
xdata = x.data;
odata = out.data;
xget = x.accessors[ 0 ];
oset = out.accessors[ 1 ];
io = offset;
for ( i = 0; i < odata.length; i++ ) {
v = xget( xdata, i );
if (
v !== void 0 &&
v !== null &&
hasOwnProp( v, prop )
) {
oset( odata, io, v[ prop ] );
}
io += stride;
}
return out;
}
// MAIN //
/**
* Extracts property values from an input object array and assigns results to elements in an output array.
*
* @param {Array} x - input array
* @param {string} prop - property to access
* @param {Array} out - output array
* @param {integer} stride - stride length for output array
* @param {NonNegativeInteger} offset - starting index for output array
* @returns {Array} output array
*
* @example
* var x = [
* {
* 'a': 1
* },
* {
* 'a': 2
* },
* {
* 'a': 3
* }
* ];
*
* var out = [ 0, 0, 0 ];
* var y = assign( x, 'a', out, 1, 0 );
* // returns [ 1, 2, 3 ]
*
* var bool = ( out === y );
* // returns true
*/
function assign( x, prop, out, stride, offset ) {
var ox;
var oo;
ox = arraylike2object( x );
oo = arraylike2object( out );
if ( ox.accessorProtocol || oo.accessorProtocol ) {
accessors( ox, prop, oo, stride, offset );
return out;
}
return internal( x, prop, out, stride, offset );
}
// EXPORTS //
module.exports = assign;
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