feat: add string/base/concat

lib/node_modules/@stdlib/string/base/concat/README.md

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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.
+
+-->
+
+# concat
+
+> Concatenate two strings.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var concat = require( '@stdlib/string/base/concat' );
+```
+
+#### concat( str1, str2 )
+
+Concatenates two strings.
+
+```javascript
+var str = concat( 'hello', 'world' );
+// returns 'helloworld'
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var concat = require( '@stdlib/string/base/concat' );
+
+var str = concat( 'hello', 'world' );
+// returns 'helloworld'
+
+str = concat( 'foo', 'bar' );
+// returns 'foobar'
+
+str = concat( 'beep', ' boop' );
+// returns 'beep boop'
+
+str = concat( '', 'baz' );
+// returns 'baz'
+
+str = concat( 'qux', '' );
+// returns 'qux'
+
+str = concat( '', '' );
+// returns ''
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/string/base/lowercase`][@stdlib/string/base/lowercase]</span><span class="delimiter">: </span><span class="description">convert a string to lowercase.</span>
+-   <span class="package-name">[`@stdlib/string/base/uppercase`][@stdlib/string/base/uppercase]</span><span class="delimiter">: </span><span class="description">convert a string to uppercase.</span>
+
+</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">
+
+<!-- <related-links> -->
+
+[@stdlib/string/base/lowercase]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/string/base/lowercase
+
+[@stdlib/string/base/uppercase]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/string/base/uppercase
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->
+

lib/node_modules/@stdlib/string/base/concat/benchmark/benchmark.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 bench = require( '@stdlib/bench' );
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var pkg = require( './../package.json' ).name;
+var concat = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var values;
+	var out;
+	var i;
+
+	values = [
+		[ 'hello', 'world' ],
+		[ 'foo', 'bar' ],
+		[ 'beep', 'boop' ]
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = concat(values[ i%values.length ][ 0 ], values[ i%values.length ][ 1 ]);
+		if ( typeof out !== 'string' ) {
+			b.fail( 'should return a string' );
+		}
+	}
+	b.toc();
+	if ( !isString( out ) ) {
+		b.fail( 'should return a string' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::builtin', function benchmark( b ) {
+	var values;
+	var out;
+	var i;
+
+	values = [
+		[ 'hello', 'world' ],
+		[ 'foo', 'bar' ],
+		[ 'beep', 'boop' ]
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		out = values[ i%values.length ][ 0 ].concat(values[ i%values.length ][ 1 ]);
+		if ( typeof out !== 'string' ) {
+			b.fail( 'should return a string' );
+		}
+	}
+	b.toc();
+	if ( !isString( out ) ) {
+		b.fail( 'should return a string' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/string/base/concat/docs/repl.txt

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+
+{{alias}}( str1, str2 )
+    Concatenates two strings.
+
+    Parameters
+    ----------
+    str1: string
+        First input string.
+
+    str2: string
+        Second input string.
+
+    Returns
+    -------
+    out: string
+        Concatenated string.
+
+    Examples
+    --------
+    > var out = {{alias}}( 'hello', 'world' )
+    'helloworld'
+    > out = {{alias}}( 'foo', 'bar' )
+    'foobar'
+    > out = {{alias}}( '', 'baz' )
+    'baz'
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/string/base/concat/docs/types/index.d.ts

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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.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Concatenates two strings.
+*
+* @param str1 - first string
+* @param str2 - second string
+* @returns concatenated string
+*
+* @example
+* var str = concat( 'hello', 'world' );
+* // returns 'helloworld'
+*/
+declare function concat( str1: string, str2: string ): string;
+
+
+// EXPORTS //
+
+export = concat;
+

lib/node_modules/@stdlib/string/base/concat/docs/types/test.ts

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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.
+*/
+
+import concat = require( './index' );
+
+
+// TESTS //
+
+// The function returns a string...
+{
+	concat( 'hello', 'world' ); // $ExpectType string
+	concat( 'foo', 'bar' ); // $ExpectType string
+	concat( 'beep' as string, 'boop' as string ); // $ExpectType string
+}
+
+// The compiler throws an error if the function is provided a value other than a string...
+{
+	concat( true, 'world' ); // $ExpectError
+	concat( false, 'world' ); // $ExpectError
+	concat( null, 'world' ); // $ExpectError
+	concat( undefined, 'world' ); // $ExpectError
+	concat( 5, 'world' ); // $ExpectError
+	concat( [], 'world' ); // $ExpectError
+	concat( {}, 'world' ); // $ExpectError
+	concat( ( x: number ): number => x, 'world' ); // $ExpectError
+	concat( 'hello', true ); // $ExpectError
+	concat( 'hello', false ); // $ExpectError
+	concat( 'hello', null ); // $ExpectError
+	concat( 'hello', undefined ); // $ExpectError
+	concat( 'hello', 5 ); // $ExpectError
+	concat( 'hello', [] ); // $ExpectError
+	concat( 'hello', {} ); // $ExpectError
+	concat( 'hello', ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided insufficient arguments...
+{
+	concat(); // $ExpectError
+	concat( 'hello' ); // $ExpectError
+}
+

lib/node_modules/@stdlib/string/base/concat/examples/index.js

@@ -0,0 +1,45 @@
+/**
+* @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';
+
+var concat = require( './../lib' );
+
+var str = concat( 'hello', 'world' );
+console.log( str );
+// => 'helloworld'
+
+str = concat( 'foo', 'bar' );
+console.log( str );
+// => 'foobar'
+
+str = concat( 'beep', ' boop' );
+console.log( str );
+// => 'beep boop'
+
+str = concat( '', 'baz' );
+console.log( str );
+// => 'baz'
+
+str = concat( 'qux', '' );
+console.log( str );
+// => 'qux'
+
+str = concat( '', '' );
+console.log( str );
+// => ''