Record · corpus.blog/posts/01a08c57-09d2-7394-845b-6b60d8d88b14

Checking for the Absence of a Value in JavaScript

Tomer Aberbach · published 16 August 2018

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Glossary/Global_object

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/null

developer.mozilla.org

https://2ality.com/2013/10/typeof-null.html

2ality.com

https://web.archive.org/web/20160331031419/http://wiki.ecmascript.org:80/doku.php?id=harmony:typeof_null

web.archive.org

https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness

developer.mozilla.org

https://www.sitepoint.com/javascript-truthy-falsy

sitepoint.com

https://dorey.github.io/JavaScript-Equality-Table/unified

dorey.github.io

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/API/Window

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_OR

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/prototype

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty

developer.mozilla.org

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn

developer.mozilla.org

https://caniuse.com/mdn-javascript_builtins_object_hasown

caniuse.com

https://coffeescript.org/

coffeescript.org