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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 setNonEnumerableReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var setReadWriteAccessor = require( '@stdlib/utils/define-read-write-accessor' );
var accessors = require( '@stdlib/array/base/accessors' );
var copy = require( '@stdlib/array/base/copy' );
// MAIN //
/**
* Zips one or more arrays to an array of composite views.
*
* ## Notes
*
* - The function assumes that the list of arrays to be zipped all have the same length.
* - The list of provided array labels should equal the number of arrays to be zipped.
* - Each view in the returned array shares the same memory as the corresponding elements in the input arrays. Accordingly, mutation of either an input array or a view will mutate the other.
*
* @param {Collection<Collection>} arrays - list of arrays to be zipped
* @param {ArrayLikeObject<string>} labels - list of array labels
* @returns {Array<Object>} output array
*
* @example
* var x = [ 1, 2, 3 ];
* var y = [ 'a', 'b', 'c' ];
*
* var labels = [ 'x', 'y' ];
*
* var z = zip2views( [ x, y ], labels );
* // returns [ <Object>, <Object>, <Object> ]
*
* var v0 = z[ 0 ].toJSON();
* // returns { 'x': 1, 'y': 'a' }
*
* var v1 = z[ 1 ].toJSON();
* // returns { 'x': 2, 'y': 'b' }
*
* var v2 = z[ 2 ].toJSON();
* // returns { 'x': 3, 'y': 'c' }
*
* // Mutate one of the input arrays:
* x[ 0 ] = 5;
*
* v0 = z[ 0 ].toJSON();
* // returns { 'x': 5, 'y': 'a' }
*
* // Set a view property:
* z[ 1 ].y = 'beep';
*
* v1 = z[ 1 ].toJSON();
* // returns { 'x': 2, 'y': 'beep' }
*
* var y1 = y.slice();
* // returns [ 'a', 'beep', 'c' ]
*/
function zip2views( arrays, labels ) {
var getter;
var setter;
var list;
var keys;
var out;
var acc;
var M;
var N;
var i;
M = arrays.length;
if ( M < 1 ) {
return [];
}
list = copy( arrays );
N = list[ 0 ].length;
if ( N < 1 ) {
return [];
}
// Resolve element accessors...
acc = [];
for ( i = 0; i < M; i++ ) {
acc.push( accessors( list[ i ] ).accessors );
}
// Create a copy of provided labels to prevent external mutation:
keys = copy( labels );
// eslint-disable-next-line stdlib/jsdoc-typedef-typos
/**
* Constructor for creating a composite view of zipped elements.
*
* @private
* @constructor
* @param {NonNegativeInteger} i - element index
* @returns {Datum} datum instance
*/
function Datum( i ) {
setNonEnumerableReadOnly( this, '_i', i );
return this;
}
// Define read/write accessors for each label...
for ( i = 0; i < M; i++ ) {
getter = getValue( list[ i ], acc[ i ][ 0 ] );
setter = setValue( list[ i ], acc[ i ][ 1 ] );
setReadWriteAccessor( Datum.prototype, keys[ i ], getter, setter );
}
// Ensure that the returned array correctly serializes to JSON:
setNonEnumerableReadOnly( Datum.prototype, 'toJSON', toJSON );
// Create a list of composite views...
out = [];
for ( i = 0; i < N; i++ ) {
out.push( new Datum( i ) );
}
return out;
/**
* Returns an accessor for returning the value associated with a label.
*
* @private
* @param {Collection} arr - input array
* @param {Function} getter - array element accessor
* @returns {Function} accessor
*/
function getValue( arr, getter ) {
return get;
/**
* Returns the value associated with a label.
*
* @private
* @returns {*} result
*/
function get() {
return getter( arr, this._i ); // eslint-disable-line no-invalid-this
}
}
/**
* Returns an accessor for setting the value associated with a label.
*
* @private
* @param {Collection} arr - input array
* @param {Function} setter - array element accessor
* @returns {Function} accessor
*/
function setValue( arr, setter ) {
return set;
/**
* Sets the value associated with a label.
*
* @private
* @param {*} value - value to set
*/
function set( value ) {
setter( arr, this._i, value ); // eslint-disable-line no-invalid-this
}
}
/**
* Serializes a datum to JSON.
*
* @private
* @returns {Object} JSON object
*/
function toJSON() {
var out;
var k;
var i;
out = {};
for ( i = 0; i < M; i++ ) {
k = keys[ i ];
out[ k ] = this[ k ]; // eslint-disable-line no-invalid-this
}
return out;
}
}
// EXPORTS //
module.exports = zip2views;
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