@stdlib/utils-eval

Alias for eval global.

Usage no npm install needed!

<script type="module">
  import stdlibUtilsEval from 'https://cdn.skypack.dev/@stdlib/utils-eval';
</script>

README

eval

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Alias for eval global.

Installation

npm install @stdlib/utils-eval

Usage

var evil = require( '@stdlib/utils-eval' );

evil( str )

Alias for eval global.

var v = evil( '5*4*3*2*1' );
// returns 120

Notes

  • A reference to eval is treated differently by the compiler. For example, when evaluating code containing block-scoped declarations (e.g., let, const, function, class), the compiler may throw an error complaining that block-scoped declarations are not yet supported outside of strict mode. One possible workaround is to include "use strict"; in the evaluated code, as done in the example below.

Examples

var evil = require( '@stdlib/utils-eval' );

var ctors;
var fcn;
var i;

function compile( ctor ) {
    var name;
    var str;

    name = ctor.match( /^(\w*)Array$/ )[ 1 ];
    name += 'DataArray';

    str = '';
    str += '(function create(){';
    str += '"use strict";';
    str += 'class '+name+' extends '+ctor+'{';
    str += 'constructor(x){';
    str += 'super(x);';
    str += '}';
    str += '}';
    str += 'return '+name+';';
    str += '})();';
    return str;
}

ctors = [
    'Int8Array',
    'Uint8Array',
    'Uint8ClampedArray',
    'Int16Array',
    'Uint16Array',
    'Int32Array',
    'Uint32Array',
    'Float32Array',
    'Float64Array',
    'Array'
];

for ( i = 0; i < ctors.length; i++ ) {
    fcn = evil( compile( ctors[i] ) );
    console.log( fcn.toString() );
}

CLI

Installation

To use the module as a general utility, install the module globally

npm install -g @stdlib/utils-eval

Usage

Usage: js-eval [options] <code>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.

Examples

$ js-eval '5*4*3*2*1'
120

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 © 2016-2022. The Stdlib Authors.