is-nan

ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Example

Number.isNaN = require('is-nan');
var assert = require('assert');

assert.notOk(Number.isNaN(undefined));
assert.notOk(Number.isNaN(null));
assert.notOk(Number.isNaN(false));
assert.notOk(Number.isNaN(true));
assert.notOk(Number.isNaN(0));
assert.notOk(Number.isNaN(42));
assert.notOk(Number.isNaN(Infinity));
assert.notOk(Number.isNaN(-Infinity));
assert.notOk(Number.isNaN('foo'));
assert.notOk(Number.isNaN(function () {}));
assert.notOk(Number.isNaN([]));
assert.notOk(Number.isNaN({}));

assert.ok(Number.isNaN(NaN));

Tests

Simply clone the repo, npm install, and run npm test

1.3.2 / 2020-12-23

• [meta] do not publish github action workflow files

1.3.1 / 2020-12-23

• [Fix] avoid mutating Number.isNaN when present
• [Dev Deps] update eslint, @ljharb/eslint-config, es5-shim, tape, functions-have-names; add safe-publish-latest
• [readme] fix repo URLs, remove defunct badges
• [Tests] migrate tests to Github Actions
• [Tests] add implementation est; run es-shim-api in postlint; use tape runner
• [actions] add "Allow Edits" workflow
• [actions] switch Automatic Rebase workflow to pull_request_target event

1.3.0 / 2019-12-15

• [New] add "auto" entry point
• [readme] fix repo URLs
• [docs] clean up README links/formatting
• [Deps] update define-properties
• [meta] add funding field; FUNDING.yml
• [meta] Only apps should have lockfiles
• [Dev Deps] update eslint, @ljharb/eslint-config, covert, es5-shim, tape, @es-shims/api
• [Tests] use shared travis-ci configs
• [Tests] use npx aud instead of nsp or npm audit with hoops
• [Tests] use functions-have-names
• [Tests] remove jscs
• [actions] add automatic rebasing / merge commit blocking

1.2.1 / 2015-08-16

• [Docs] Update readme

1.2.0 / 2015-08-16

• [New] Implement the es-shim API interface
• [Dev Deps] update eslint, tape, es5-shim, @ljharb/eslint-config
• [Tests] up to io.js v3.0
• [Docs] Switch from vb.teelaun.ch to versionbadg.es for the npm version badge SVG
• [Security] Add npm run security

1.1.0 / 2015-06-24

• Add a "shim" method
• Add npm run eslint
• Test latest node and io.js on travis-ci
• Add license and download badges to README
• Update tape, covert, jscs

1.0.1 / 2014-07-05

• Oops, jscs should be a devDependency

1.0.0 / 2014-07-05

• Initial release.