npm package: @stdlib/utils-mask-arguments
Description: Create a function that invokes a provided function according to an argument mask.
Author: The Stdlib Authors
Latest version: 0.2.3

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# maskArguments

[![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 invokes a provided function according to an argument mask.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var maskArguments = require( '@stdlib/utils-mask-arguments' );
```

#### maskArguments( fcn, mask\[, thisArg] )

Returns a `function` that invokes a provided function according to an argument `mask`.

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

var bar = maskArguments( foo, [ 1, 0, 1 ] );

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

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

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

```javascript
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 = maskArguments( foo.scale, [ 1, 0, 1 ], ctx );

var out = bar( 1, 2, 3 );
// returns [ 10, 60 ]
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   Only those arguments having a truthy mask value are applied to a provided function.

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var filledarrayBy = require( '@stdlib/array-filled-by' );
var Uint8Array = require( '@stdlib/array-uint8' );
var add = require( '@stdlib/number-float64-base-add' );
var maskArguments = require( '@stdlib/utils-mask-arguments' );

function fill( i ) {
    return i;
}

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

// Create a mask array:
var mask = new Uint8Array( x.length );

// "Unmask" the first element:
mask[ 0 ] = 1;

// Compute the sum of consecutive elements...
var f;
var i;
for ( i = 1; i < x.length; i++ ) {
    // "Unmask" the next element:
    mask[ i ] = 1;

    // Compute the sum:
    f = maskArguments( add, mask );
    console.log( 'sum(x_%d, x_%d) = %d', i-1, i, f.apply( null, x ) );

    // Update the mask:
    mask[ i-1 ] = 0;
}
```

</section>

<!-- /.examples -->

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</section>

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<section class="related">

* * *

## 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>
-   <span class="package-name">[`@stdlib/utils-reject-arguments`][@stdlib/utils/reject-arguments]</span><span class="delimiter">: </span><span class="description">create a function that invokes a provided function according to a predicate function.</span>
-   <span class="package-name">[`@stdlib/utils-reorder-arguments`][@stdlib/utils/reorder-arguments]</span><span class="delimiter">: </span><span class="description">create a function that invokes a provided function with reordered arguments.</span>
-   <span class="package-name">[`@stdlib/utils-reverse-arguments`][@stdlib/utils/reverse-arguments]</span><span class="delimiter">: </span><span class="description">create a function that invokes a provided function with arguments in reverse order.</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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<!-- <related-links> -->

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

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

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

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

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</section>

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