159 lines
2.8 KiB
Markdown
159 lines
2.8 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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# eval
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> Alias for [`eval`][mdn-eval] global.
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<section class="usage">
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## Usage
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```javascript
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var evil = require( '@stdlib/utils/eval' );
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```
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#### evil( str )
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Alias for [`eval`][mdn-eval] global.
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```javascript
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var v = evil( '5*4*3*2*1' );
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// returns 120
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- A reference to [`eval`][mdn-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.
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var evil = require( '@stdlib/utils/eval' );
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var ctors;
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var fcn;
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var i;
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function compile( ctor ) {
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var name;
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var str;
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name = ctor.match( /^(\w*)Array$/ )[ 1 ];
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name += 'DataArray';
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str = '';
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str += '(function create(){';
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str += '"use strict";';
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str += 'class '+name+' extends '+ctor+'{';
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str += 'constructor(x){';
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str += 'super(x);';
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str += '}';
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str += '}';
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str += 'return '+name+';';
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str += '})();';
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return str;
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}
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ctors = [
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'Int8Array',
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'Uint8Array',
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'Uint8ClampedArray',
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'Int16Array',
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'Uint16Array',
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'Int32Array',
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'Uint32Array',
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'Float32Array',
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'Float64Array',
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'Array'
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];
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for ( i = 0; i < ctors.length; i++ ) {
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fcn = evil( compile( ctors[i] ) );
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console.log( fcn.toString() );
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}
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```
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</section>
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<!-- /.examples -->
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* * *
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<section class="cli">
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## CLI
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<section class="usage">
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### Usage
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```text
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Usage: js-eval [options] <code>
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Options:
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-h, --help Print this message.
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-V, --version Print the package version.
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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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```bash
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$ js-eval '5*4*3*2*1'
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120
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.cli -->
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<section class="links">
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[mdn-eval]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval
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</section>
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<!-- /.links -->
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