About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
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Test if a value is a native function.
Native functions execute native code that is typically not written in JavaScript, but a lower-level language like C++. This includes the JavaScript built-in functions, functions implemented using Node.js C/C++ addons, and code compiled via WebAssembly.
To use in Observable,
isNativeFunction = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-native-function@umd/browser.js' )The previous example will load the latest bundled code from the umd branch. Alternatively, you may load a specific version by loading the file from one of the tagged bundles. For example,
isNativeFunction = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-native-function@v0.2.2-umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var isNativeFunction = require( 'path/to/vendor/umd/assert-is-native-function/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-native-function@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.isNativeFunction;
})();
</script>Tests if a value is a native function.
var bool = isNativeFunction( Date );
// returns true
function beep() {
console.log( 'beep' );
}
bool = isNativeFunction( beep );
// returns false<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-native-function@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var bool = isNativeFunction( Math.sqrt );
// returns true
bool = isNativeFunction( Date );
// returns true
bool = isNativeFunction( RegExp );
// returns true
bool = isNativeFunction( function foo() {} );
// returns false
bool = isNativeFunction( 'beep' );
// returns false
bool = isNativeFunction( 5 );
// returns false
bool = isNativeFunction( true );
// returns false
bool = isNativeFunction( null );
// returns false
bool = isNativeFunction( [] );
// returns false
bool = isNativeFunction( {} );
// returns false
})();
</script>
</body>
</html>@stdlib/assert-is-function: test if a value is a function.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.