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Non-Enumerable Read-Only

Define a non-enumerable read-only property.

Installation

npm install @stdlib/utils-define-nonenumerable-read-only-property

Alternatively,

To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
If you are using Deno, visit the deno branch (see README for usage intructions).
For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md 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

var setNonEnumerableReadOnly = require( '@stdlib/utils-define-nonenumerable-read-only-property' );

setNonEnumerableReadOnly( obj, prop, value )

Defines a non-enumerable read-only property.

var obj = {};

setNonEnumerableReadOnly( obj, 'foo', 'bar' );

obj.foo = 'boop';
// throws <Error>

Notes

Non-enumerable read-only properties are non-configurable.

Examples

var setNonEnumerableReadOnly = require( '@stdlib/utils-define-nonenumerable-read-only-property' );

function Foo( name ) {
    if ( !(this instanceof Foo) ) {
        return new Foo( name );
    }
    setNonEnumerableReadOnly( this, 'name', name );
    return this;
}

var foo = new Foo( 'beep' );

try {
    foo.name = 'boop';
} catch ( err ) {
    console.error( err.message );
}

See Also

@stdlib/utils-define-nonenumerable-property: define a non-enumerable property.
@stdlib/utils-define-nonenumerable-read-only-accessor: define a non-enumerable read-only accessor.
@stdlib/utils-define-nonenumerable-read-write-accessor: define a non-enumerable read-write accessor.
@stdlib/utils-define-nonenumerable-write-only-accessor: define a non-enumerable write-only accessor.
@stdlib/utils-define-read-only-property: define a read-only property.

Notice

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

Community

License

See LICENSE.

Copyright

Copyright © 2016-2025. The Stdlib Authors.

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