feat: add utils/json-pointer/has

lib/node_modules/@stdlib/utils/json-pointer/has/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.
+
+-->
+
+# has
+
+> Test if a [JSON Pointer][json-pointer] ([RFC 6901][rfc-6901]) resolves to a value in a document.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var has = require( '@stdlib/utils/json-pointer/has' );
+```
+
+#### has( document, pointer )
+
+Tests if a [JSON Pointer][json-pointer] resolves to a value in a document.
+
+```javascript
+var obj = {
+    'foo': [ 'bar', 'baz' ]
+};
+var bool = has( obj, '/foo/0' );
+// returns true
+
+obj = {
+    'foo': 'bar'
+};
+bool = has( obj, '/foo' );
+// returns true
+
+bool = has( obj, '/missing' );
+// returns false
+
+bool = has( obj, '' );
+// returns true
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   Per [RFC 6901][rfc-6901], an empty string refers to the root of the document and returns `true` for any valid object or array.
+-   The `-` token on an array references the position after the last element (nonexistent element), so it returns `false`.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+<!-- eslint no-undef: "error" -->
+
+## Examples
+
+```javascript
+var has = require( '@stdlib/utils/json-pointer/has' );
+
+var doc = {
+    'foo': [ 'bar', 'baz' ],
+    '': 0,
+    'a/b': 1,
+    'm~n': 8
+};
+
+var bool = has( doc, '/foo' );
+// returns true
+
+bool = has( doc, '/foo/0' );
+// returns true
+
+bool = has( doc, '/foo/99' );
+// returns false
+
+bool = has( doc, '/foo/-' );
+// returns false
+
+bool = has( doc, '/' );
+// returns true
+
+bool = has( doc, '/a~1b' );
+// returns true
+
+bool = has( doc, '/m~0n' );
+// returns true
+
+bool = has( doc, '/nonexistent' );
+// returns false
+
+bool = has( doc, '' );
+// returns true
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="references">
+
+## References
+
+-   [RFC 6901 - JavaScript Object Notation (JSON) Pointer][rfc-6901]
+
+</section>
+
+<!-- /.references -->
+
+<!-- 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">
+
+[json-pointer]: https://datatracker.ietf.org/doc/html/rfc6901
+
+[rfc-6901]: https://datatracker.ietf.org/doc/html/rfc6901
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/utils/json-pointer/has/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 format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var has = require( './../lib' );
+
+
+// MAIN //
+
+bench( format( '%s:shallow', pkg ), function benchmark( b ) {
+	var doc;
+	var out;
+	var i;
+
+	doc = {
+		'foo': 'bar',
+		'baz': 'qux'
+	};
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = has( doc, '/foo' );
+		if ( typeof out !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( out !== true ) {
+		b.fail( 'should return expected value' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( format( '%s:deep', pkg ), function benchmark( b ) {
+	var doc;
+	var out;
+	var i;
+
+	doc = {
+		'a': {
+			'b': {
+				'c': {
+					'd': {
+						'e': {
+							'f': 42
+						}
+					}
+				}
+			}
+		}
+	};
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = has( doc, '/a/b/c/d/e/f' );
+		if ( typeof out !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( out !== true ) {
+		b.fail( 'should return expected value' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( format( '%s:array', pkg ), function benchmark( b ) {
+	var doc;
+	var out;
+	var i;
+
+	doc = {
+		'arr': [
+			[ 10, 20 ],
+			[ 30, 40 ]
+		]
+	};
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = has( doc, '/arr/0/1' );
+		if ( typeof out !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( out !== true ) {
+		b.fail( 'should return expected value' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( format( '%s:missing', pkg ), function benchmark( b ) {
+	var doc;
+	var out;
+	var i;
+
+	doc = {
+		'foo': 'bar'
+	};
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = has( doc, '/missing' );
+		if ( typeof out !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( out !== false ) {
+		b.fail( 'should return expected value' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( format( '%s:root', pkg ), function benchmark( b ) {
+	var doc;
+	var out;
+	var i;
+
+	doc = {
+		'foo': 'bar'
+	};
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = has( doc, '' );
+		if ( typeof out !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( out !== true ) {
+		b.fail( 'should return expected value' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/utils/json-pointer/has/docs/repl.txt

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+
+{{alias}}( document, pointer )
+    Tests if a JSON Pointer resolves to a value in a document.
+
+    Per RFC 6901, an empty string refers to the root of the document and
+    returns `true` for any valid object or array.
+
+    The `-` token on an array references the position after the last element
+    (nonexistent element), so it returns `false`.
+
+    Parameters
+    ----------
+    document: Object|Array
+        JSON document.
+
+    pointer: string
+        JSON Pointer string.
+
+    Returns
+    -------
+    bool: boolean
+        Boolean indicating if pointer resolves.
+
+    Examples
+    --------
+    > var bool = {{alias}}( { 'foo': [ 'bar', 'baz' ] }, '/foo/0' )
+    true
+    > bool = {{alias}}( { 'foo': 'bar' }, '/foo' )
+    true
+    > bool = {{alias}}( { 'foo': 'bar' }, '/missing' )
+    false
+    > bool = {{alias}}( { 'foo': 'bar' }, '' )
+    true
+
+    See Also
+    --------
+