108 lines
1.9 KiB
Markdown
108 lines
1.9 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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# Argument Function
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> Create an argument function.
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<section class="intro">
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</section>
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<!-- /.intro -->
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<section class="usage">
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## Usage
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```javascript
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var argumentFunction = require( '@stdlib/utils/argument-function' );
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```
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#### argumentFunction( idx )
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Returns a `function` which always returns an argument corresponding to a specified argument index.
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```javascript
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var argn = argumentFunction( 1 );
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// returns <Function>
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var v = argn( 1.0, 2.0, 3.0 );
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// returns 2.0
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v = argn( 'a', 'b', 'c' );
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// returns 'b'
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```
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If an argument function is provided fewer arguments than the specified argument index, an argument function returns `undefined`.
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```javascript
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var argn = argumentFunction( 100 );
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// returns <Function>
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var v = argn( 1.0 );
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// returns undefined
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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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- Argument indices are **zero-based**.
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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 randu = require( '@stdlib/random/base/randu' );
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var argumentFunction = require( '@stdlib/utils/argument-function' );
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var argn;
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var v;
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var i;
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argn = argumentFunction( 1 );
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for ( i = 0; i < 10; i++ ) {
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v = argn( randu(), randu()*10.0, randu()*100.0 );
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console.log( v );
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}
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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</section>
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<!-- /.links -->
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