All files accessors.js

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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 join = require( '@stdlib/array/base/join' );
 
 
// MAIN //
 
/**
* Returns a string created by joining strided array elements using a specified separator.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {*} separator - separator
* @param {Object} x - input array object
* @param {Collection} x.data - input array data
* @param {Array<Function>} x.accessors - array element accessors
* @param {integer} strideX - stride length
* @param {NonNegativeInteger} offsetX - starting index
* @returns {string} joined string
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 1, 2, 3, 4 ];
*
* var str = gjoin( x.length, ',', arraylike2object( toAccessorArray( x ) ), 1, 0 );
* // returns '1,2,3,4'
*/
function gjoin( N, separator, x, strideX, offsetX ) {
	var xbuf;
	var view;
	var get;
	var ix;
	var i;
 
	// Cache reference to array data:
	xbuf = x.data;
 
	// Cache a reference to the element accessor:
	get = x.accessors[ 0 ];
 
	// Create a view of the strided elements
	view = [];
	ix = offsetX;
	for ( i = 0; i < N; i++ ) {
		view.push( get( xbuf, ix ) );
		ix += strideX;
	}
 
	return join( view, separator );
}
 
 
// EXPORTS //
 
module.exports = gjoin;