100 lines
2.1 KiB
Markdown
100 lines
2.1 KiB
Markdown
<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# Native Function
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> [Regular expression][regexp] to match a native function.
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<section class="usage">
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## Usage
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```javascript
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var reNativeFunction = require( '@stdlib/regexp/native-function' );
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```
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#### reNativeFunction()
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Returns a [regular expression][regexp] to match a native `function`.
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```javascript
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var RE_NATIVE_FUNCTION = reNativeFunction();
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var bool = RE_NATIVE_FUNCTION.test( Date.toString() );
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// returns true
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```
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#### reNativeFunction.REGEXP
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[Regular expression][regexp] to match a native `function`.
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```javascript
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var bool = reNativeFunction.REGEXP.test( Date.toString() );
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// returns true
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint-disable no-restricted-syntax, no-empty-function, stdlib/no-builtin-math -->
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<!-- eslint no-undef: "error" -->
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```javascript
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var Int8Array = require( '@stdlib/array/int8' );
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var reNativeFunction = require( '@stdlib/regexp/native-function' );
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var RE_NATIVE_FUNCTION = reNativeFunction();
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function isNativeFunction( fcn ) {
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return RE_NATIVE_FUNCTION.test( fcn.toString() );
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}
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var bool = isNativeFunction( Math.sqrt );
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// returns true
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bool = isNativeFunction( String );
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// returns true
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bool = isNativeFunction( Int8Array );
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// returns true
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bool = isNativeFunction( Date );
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// returns true
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bool = isNativeFunction( function noop() {} );
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// returns false
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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</section>
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<!-- /.links -->
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