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https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property

Define a configurable memoized read-only object property.
https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property

configurable define descriptor enumerable javascript node node-js nodejs object prop property read-only set stdlib util utilities utility utils value writable

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Define a configurable memoized read-only object property.

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README 

        



  

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# Configurable Memoized Read-Only



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



> [Define][mdn-define-property] a configurable memoized **read-only** object property.



## Installation



```bash

npm install @stdlib/utils-define-memoized-configurable-read-only-property

```



Alternatively,



-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).

-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).

-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).



The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.



To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.



## Usage



```javascript

var setMemoizedConfigurableReadOnly = require( '@stdlib/utils-define-memoized-configurable-read-only-property' );

```



#### setMemoizedConfigurableReadOnly( obj, prop, fcn )



[Defines][mdn-define-property] a configurable memoized **read-only** object property.



```javascript

var obj = {};



function foo() {

    return 'bar';

}



setMemoizedConfigurableReadOnly( obj, 'foo', foo );



var v = obj.foo;

// returns 'bar'

```



The last argument should be a synchronous function whose return value will be memoized and set as the property value.



## Notes



-   A configurable **read-only** property is **enumerable**.



## Examples



```javascript

var fibonacci = require( '@stdlib/math-base-special-fibonacci' );

var setMemoizedConfigurableReadOnly = require( '@stdlib/utils-define-memoized-configurable-read-only-property' );



function Foo() {

    var self;

    if ( !(this instanceof Foo) ) {

        return new Foo();

    }

    self = this;

    this.count = 0;

    setMemoizedConfigurableReadOnly( this, 'fibo', fibo );

    return this;



    function fibo() {

        self.count += 1;

        return fibonacci( 73 );

    }

}



var foo = new Foo();



var i;

for ( i = 0; i < 10; i++ ) {

    console.log( 'F: %d. Count: %d.', foo.fibo, foo.count );

}

```



* * *



## See Also



-   [`@stdlib/utils-define-configurable-read-only-property`][@stdlib/utils/define-configurable-read-only-property]: define a configurable read-only property.

-   [`@stdlib/utils-define-memoized-read-only-property`][@stdlib/utils/define-memoized-read-only-property]: define a memoized read-only object property.

-   [`@stdlib/utils-define-read-only-property`][@stdlib/utils/define-read-only-property]: define a read-only property.



* * *



## 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 © 2016-2024. The Stdlib [Authors][stdlib-authors].



[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-define-memoized-configurable-read-only-property.svg

[npm-url]: https://npmjs.org/package/@stdlib/utils-define-memoized-configurable-read-only-property



[test-image]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-define-memoized-configurable-read-only-property/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/utils-define-memoized-configurable-read-only-property?branch=main



[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg

[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im



[stdlib]: https://github.com/stdlib-js/stdlib



[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors



[umd]: https://github.com/umdjs/umd

[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules



[deno-url]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/tree/deno

[deno-readme]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/tree/umd

[umd-readme]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/tree/esm

[esm-readme]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/utils-define-memoized-configurable-read-only-property/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-define-memoized-configurable-read-only-property/main/LICENSE



[mdn-define-property]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty



[@stdlib/utils/define-configurable-read-only-property]: https://github.com/stdlib-js/utils-define-configurable-read-only-property



[@stdlib/utils/define-memoized-read-only-property]: https://github.com/stdlib-js/utils-define-memoized-read-only-property



[@stdlib/utils/define-read-only-property]: https://github.com/stdlib-js/utils-define-read-only-property