feat: add blas/ext/base/ndarray/gjoin-between

lib/node_modules/@stdlib/blas/ext/base/ndarray/gjoin-between/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 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.
+
+-->
+
+# gjoinBetween
+
+> Return a string by joining one-dimensional ndarray elements using a specified separator for each pair of consecutive elements.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var gjoinBetween = require( '@stdlib/blas/ext/base/ndarray/gjoin-between' );
+```
+
+#### gjoinBetween( arrays )
+
+Returns a string by joining one-dimensional ndarray elements using a specified separator for each pair of consecutive elements.
+
+```javascript
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+
+var xbuf = [ 1, 2, 3, 4 ];
+var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+
+var prefix = scalar2ndarray( 'op: ', {
+    'dtype': 'generic'
+});
+
+var suffix = scalar2ndarray( '', {
+    'dtype': 'generic'
+});
+
+var sbuf = [ ' + ', ' - ', ' != ' ];
+var separators = new ndarray( 'generic', sbuf, [ 3 ], [ 1 ], 0, 'row-major' );
+
+var out = gjoinBetween( [ x, prefix, suffix, separators ] );
+// returns 'op: 1 + 2 - 3 != 4'
+```
+
+The function has the following parameters:
+
+-   **arrays**: array-like object containing the following ndarrays:
+
+    -   a one-dimensional input ndarray.
+    -   a zero-dimensional ndarray containing a prefix string.
+    -   a zero-dimensional ndarray containing a suffix string.
+    -   a one-dimensional ndarray containing separator strings.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   If the input ndarray is empty, the function returns the prefix and suffix joined together.
+-   The `separators` ndarray is assumed to have at least `N-1` elements (i.e., equal to the number of "gaps" between consecutive elements), where `N` is the number of elements in the input ndarray.
+-   If an array element is either `null` or `undefined`, the function serializes the element as an empty string.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var filled = require( '@stdlib/array/base/filled' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var ndarray2array = require( '@stdlib/ndarray/to-array' );
+var gjoinBetween = require( '@stdlib/blas/ext/base/ndarray/gjoin-between' );
+
+var xbuf = discreteUniform( 10, -100, 100, {
+    'dtype': 'generic'
+});
+var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
+console.log( ndarray2array( x ) );
+
+var prefix = scalar2ndarray( '[ ', {
+    'dtype': 'generic'
+});
+
+var suffix = scalar2ndarray( ' ]', {
+    'dtype': 'generic'
+});
+
+var sbuf = filled( ' | ', xbuf.length - 1 );
+var separators = new ndarray( 'generic', sbuf, [ sbuf.length ], [ 1 ], 0, 'row-major' );
+
+var out = gjoinBetween( [ x, prefix, suffix, separators ] );
+console.log( out );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/blas/ext/base/ndarray/gjoin-between/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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 bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var pow = require( '@stdlib/math/base/special/pow' );
+var filled = require( '@stdlib/array/base/filled' );
+var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var gjoinBetween = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'generic'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var separators;
+	var prefix;
+	var suffix;
+	var sbuf;
+	var xbuf;
+	var x;
+
+	xbuf = uniform( len, 0.0, 100.0, options );
+	x = new ndarray( options.dtype, xbuf, [ len ], [ 1 ], 0, 'row-major' );
+
+	prefix = scalar2ndarray( '[ ', {
+		'dtype': 'generic'
+	});
+
+	suffix = scalar2ndarray( ' ]', {
+		'dtype': 'generic'
+	});
+
+	sbuf = filled( ',', len - 1 );
+	separators = new ndarray( 'generic', sbuf, [ sbuf.length ], [ 1 ], 0, 'row-major' );
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var out;
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			out = gjoinBetween( [ x, prefix, suffix, separators ] );
+			if ( !isString( out ) ) {
+				b.fail( 'should return a string' );
+			}
+		}
+		b.toc();
+		if ( !isString( out ) ) {
+			b.fail( 'should return a string' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( format( '%s:len=%d', pkg, len ), f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/blas/ext/base/ndarray/gjoin-between/docs/repl.txt

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+
+{{alias}}( arrays )
+    Returns a string by joining one-dimensional ndarray elements using a
+    specified separator for each pair of consecutive elements.
+
+    If the input ndarray is empty, the function returns the prefix and suffix
+    joined together.
+
+    If an array element is either `null` or `undefined`, the function serializes
+    the element as an empty string.
+
+    Parameters
+    ----------
+    arrays: ArrayLikeObject<ndarray>
+        Array-like object containing the following ndarrays:
+
+        - a one-dimensional input ndarray.
+        - a zero-dimensional ndarray containing a prefix string.
+        - a zero-dimensional ndarray containing a suffix string.
+        - a one-dimensional ndarray containing separator strings.
+
+    Returns
+    -------
+    out: string
+        Joined string.
+
+    Examples
+    --------
+    > var xbuf = [ 1, 2, 3, 4 ];
+    > var dt = 'generic';
+    > var sh = [ xbuf.length ];
+    > var sx = [ 1 ];
+    > var ox = 0;
+    > var ord = 'row-major';
+    > var x = new {{alias:@stdlib/ndarray/ctor}}( dt, xbuf, sh, sx, ox, ord );
+    > var p = {{alias:@stdlib/ndarray/from-scalar}}( '', { 'dtype': dt } );
+    > var s = {{alias:@stdlib/ndarray/from-scalar}}( '', { 'dtype': dt } );
+    > var sbuf = [ ',', '-', '|' ];
+    > var sh2 = [ sbuf.length ];
+    > var sep = new {{alias:@stdlib/ndarray/ctor}}( dt, sbuf, sh2, sx, ox, ord );
+    > {{alias}}( [ x, p, s, sep ] )
+    '1,2-3|4'
+
+    See Also
+    --------

lib/node_modules/@stdlib/blas/ext/base/ndarray/gjoin-between/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2026 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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { typedndarray } from '@stdlib/types/ndarray';
+
+/**
+* Returns a string by joining one-dimensional ndarray elements using a specified separator for each pair of consecutive elements.
+*
+* @param arrays - array-like object containing a one-dimensional input ndarray, a zero-dimensional ndarray containing a prefix string, a zero-dimensional ndarray containing a suffix string, and a one-dimensional ndarray containing separator strings
+* @returns joined string
+*
+* @example
+* var ndarray = require( '@stdlib/ndarray/base/ctor' );
+* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+*
+* var xbuf = [ 1, 2, 3, 4 ];
+* var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
+*
+* var prefix = scalar2ndarray( 'op: ', {
+*     'dtype': 'generic'
+* });
+*
+* var suffix = scalar2ndarray( '', {
+*     'dtype': 'generic'
+* });
+*
+* var sbuf = [ ' + ', ' - ', ' != ' ];
+* var separators = new ndarray( 'generic', sbuf, [ 3 ], [ 1 ], 0, 'row-major' );
+*
+* var v = gjoinBetween( [ x, prefix, suffix, separators ] );
+* // returns 'op: 1 + 2 - 3 != 4'
+*/
+declare function gjoinBetween<T = unknown>( arrays: [ typedndarray<T>, typedndarray<string>, typedndarray<string>, typedndarray<string> ] ): string;
+
+
+// EXPORTS //
+
+export = gjoinBetween;