eval
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' );
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.
License
See LICENSE.
Copyright
Copyright © 2016-2021. The Stdlib Authors.