isError

Test if a value is an Error object.

Installation

npm install @stdlib/assert-is-error

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 isError = require( '@stdlib/assert-is-error' );

isError( value )

Tests if a value is an Error object.

var bool = isError( new Error( 'beep' ) );
// returns true

Examples

var isError = require( '@stdlib/assert-is-error' );

var bool = isError( new Error( 'error' ) );
// returns true

bool = isError( new EvalError( 'eval error' ) );
// returns true

bool = isError( new RangeError( 'range error' ) );
// returns true

bool = isError( new ReferenceError( 'reference error' ) );
// returns true

bool = isError( new SyntaxError( 'syntax error' ) );
// returns true

bool = isError( new TypeError( 'type error' ) );
// returns true

bool = isError( new URIError( 'URI error' ) );
// returns true

bool = isError( {} );
// returns false

bool = isError( null );
// returns false

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.