<!-- @license Apache-2.0 Copyright (c) 2018 The Stdlib Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> # Read-Only Accessor > [Define][@stdlib/utils/define-property] a **read-only** accessor. <section class="usage"> ## Usage ```javascript var setReadOnlyAccessor = require( '@stdlib/utils/define-read-only-accessor' ); ``` #### setReadOnlyAccessor( obj, prop, getter ) [Defines][@stdlib/utils/define-property] a **read-only** accessor. <!-- run throws: true --> ```javascript function getter() { return 'bar'; } var obj = {}; setReadOnlyAccessor( obj, 'foo', getter ); obj.foo = 'boop'; // throws <Error> ``` </section> <!-- /.usage --> <section class="notes"> ## Notes - Read-only accessors are **enumerable** and **non-configurable**. </section> <!-- /.notes --> <section class="examples"> ## Examples <!-- eslint no-undef: "error" --> ```javascript var setReadOnlyAccessor = require( '@stdlib/utils/define-read-only-accessor' ); function Foo( name ) { if ( !(this instanceof Foo) ) { return new Foo( name ); } setReadOnlyAccessor( this, 'name', getName ); return this; function getName() { return name; } } var foo = new Foo( 'beep' ); try { foo.name = 'boop'; } catch ( err ) { console.error( err.message ); } ``` </section> <!-- /.examples --> <section class="links"> [@stdlib/utils/define-property]: https://www.npmjs.com/package/@stdlib/utils/tree/main/define-property </section> <!-- /.links -->