npm package: @stdlib/utils-map-arguments
Description: Create a function that applies arguments to a provided function after transforming arguments according to a callback function.
Author: The Stdlib Authors
Latest version: 0.3.1

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# mapArguments

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Create a function that applies arguments to a provided function after transforming arguments according to a callback function.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/utils-map-arguments
```

</section>

<section class="usage">

## Usage

```javascript
var mapArguments = require( '@stdlib/utils-map-arguments' );
```

#### mapArguments( fcn, clbk\[, thisArg] )

Returns a `function` that invokes a provided function after transforming arguments according to a callback function.

```javascript
function foo( a, b, c ) {
    return [ a, b, c ];
}

function clbk( v ) {
    return v * 2;
}

var bar = mapArguments( foo, clbk );

var out = bar( 1, 2, 3 );
// returns [ 2, 4, 6 ]
```

The `clbk` function is provided the following arguments:

-   **value**: argument value.
-   **index**: argument index.

To set the `this` context when invoking the input function, provide a `thisArg`.

<!-- eslint-disable no-restricted-syntax -->

```javascript
function clbk( v ) {
    return v * 2;
}

function Foo() {
    this.x = 1;
    this.y = 2;
}

Foo.prototype.scale = function scale( a, b ) {
    return [ this.x*a, this.y*b ];
};

var ctx = {
    'x': 10,
    'y': 20
};

var foo = new Foo();

var bar = mapArguments( foo.scale, clbk, ctx );

var out = bar( 1, 2 );
// returns [ 20, 80 ]
```

</section>

<!-- /.usage -->

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<section class="notes">

</section>

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<!-- Package usage examples. -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var filledarrayBy = require( '@stdlib/array-filled-by' );
var add = require( '@stdlib/number-float64-base-add' );
var filterArguments = require( '@stdlib/utils-filter-arguments' );
var mapArguments = require( '@stdlib/utils-map-arguments' );

function fill( i ) {
    return i;
}

function scale( v ) {
    return v * 2.0;
}

function factory( i, j ) {
    return predicate;

    function predicate( value, index ) {
        return ( i <= index ) && ( index < j );
    }
}

// Create a data array:
var x = filledarrayBy( 10, 'float64', fill );

// Compute the sum of consecutive squared elements...
var f;
var i;
for ( i = 0; i < x.length-1; i++ ) {
    f = filterArguments( mapArguments( add, scale ), factory( i, i+2 ) );
    console.log( 'sum(x_%d^2, x_%d^2) = %d', i, i+1, f.apply( null, x ) );
}
```

</section>

<!-- /.examples -->

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* * *

## See Also

-   <span class="package-name">[`@stdlib/utils-filter-arguments`][@stdlib/utils/filter-arguments]</span><span class="delimiter">: </span><span class="description">create a function that invokes a provided function according to a predicate function.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[@stdlib/utils/filter-arguments]: https://www.npmjs.com/package/@stdlib/utils-filter-arguments

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