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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 isUndefinedOrNull = require( '@stdlib/assert/is-undefined-or-null' );
// MAIN //
/**
* Returns a string created by joining strided array elements using a specified separator.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {string} 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 out = gjoin( x.length, ',', arraylike2object( toAccessorArray( x ) ), 1, 0 );
* // returns '1,2,3,4'
*/
function gjoin( N, separator, x, strideX, offsetX ) {
var xbuf;
var get;
var out;
var ix;
var v;
var i;
// Cache reference to array data:
xbuf = x.data;
// Cache a reference to the element accessor:
get = x.accessors[ 0 ];
ix = offsetX;
out = '';
for ( i = 0; i < N; i++ ) {
if ( i > 0 ) {
out += separator;
}
v = get( xbuf, ix );
if ( !isUndefinedOrNull( v ) ) {
out += String( v );
}
ix += strideX;
}
return out;
}
// EXPORTS //
module.exports = gjoin;
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