@stdlib/function-to-string

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function2string

Return a string representing the source code of a provided function.

Installation

npm install @stdlib/function-to-string

Usage

var function2string = require( '@stdlib/function-to-string' );

function2string( fcn )

Returns a string representing the source code of a provided function.

function add( x, y ) {
    return x + y;
}

var str = function2string( add );
// e.g., returns 'function add( x, y ) {\n    return x + y;\n}'

Notes

• If called on built-in functions, functions created by Function.prototype.bind(), or other non-JavaScript functions, the function returns a "native" function string similar to the following:

  "function foo() { [native code] }"
  

  For intrinsic object methods and functions, foo is the initial name of the function.

• If called on a function created by the Function constructor, the function returns the source code of a synthesized function declaration having the name "anonymous" and using the provided parameters and function body.

• Starting in ES2018, the ECMAScript specification requires that the returned string contain the exact same source code as it was declared, including any whitespace and/or comments. If the host is unable to access the source code, the specification requires that the returned string be the native function string.

Examples

var ndarray = require( '@stdlib/ndarray-ctor' );
var erf = require( '@stdlib/math-base-special-erf' );
var daxpy = require( '@stdlib/blas-base-daxpy' );
var kebabcase = require( '@stdlib/string-kebabcase' );
var randu = require( '@stdlib/random-base-randu' );
var format = require( '@stdlib/string-format' );
var function2string = require( '@stdlib/function-to-string' );

var fcns = [
    [ 'ndarray', ndarray ],
    [ 'erf', erf ],
    [ 'daxpy', daxpy ],
    [ 'kebabcase', kebabcase ],
    [ 'randu', randu ],
    [ 'format', format ],
    [ 'function2string', function2string ]
];

var i;
for ( i = 0; i < fcns.length; i++ ) {
    console.log( format( 'Function: %s\n\n%s\n', fcns[ i ][ 0 ], function2string( fcns[ i ][ 1 ] ) ) );
}

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See Also

• @stdlib/function-ctor: function constructor.

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Notice

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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.