https://stackoverflow.com › questions › 18808226
javascript - Why is typeof null "object"? - Stack OverflowIf null is a primitive, why does typeof(null) return "object"? in short: it is bug in ECMAScript, and the type should be null reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null
https://stackoverflow.com › questions › 21089738
Why typeof null is 'object' in javascript? - Stack OverflowActually, it is. The third answer states that "null is not an object, it is a primitive value. For example, you cannot add properties to it. Sometimes people wrongly assume that it is an object, because typeof null returns "object". But that is actually a bug (that might even be fixed in ECMAScript 6)." –
https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Operators › typeof
L'opérateur typeof - JavaScript | MDN - MDN Web DocsPar conséquent, l'étiquette de type de null valait 0, d'où le comportement de typeof . Un correctif fut proposé pour ECMAScript, mais il fut refusé . Avec cette version, on aurait eu typeof null === 'null' .
https://www.w3schools.com › JS › › js_typeof.asp
JavaScript typeof - W3SchoolsUnfortunately, in JavaScript, the data type of null is an object. You can empty an object by setting it to null:
https://dev.to › _ravo_lution › why-typeof-null-is-object-181
Why typeof(null) is "object"? - DEV CommunityWhy typeof(null) is "object"? Context👀 If you are a developer dealing with `JavaScript` on a daily basis then it is very likely to assume that you have at least heard about the typeof operator.
https://developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Operators › typeof
typeof - JavaScript | MDN - MDN Web DocsThe type tag for objects was 0. null was represented as the NULL pointer (0x00 in most platforms). Consequently, null had 0 as type tag, hence the typeof return value "object". A fix was proposed for ECMAScript (via an opt-in), but was rejected. It would have resulted in typeof null === "null".
https://alexanderell.is › posts › typeof-null
typeof null: investigating a classic JavaScript bugFor this post, I’d like to investigate another unexpected behavior in JavaScript: why typeof(null) evaluates as 'object'. This is a well-known bug, and we’ll investigate first in the ECMAScript specification followed by a deep dive into an early implementation of JavaScript to see the bug in its natural habitat. The main idea is that the ...
https://www.freecodecamp.org › news › javascript-typeof-how-to-check-the-type-of-a...
JavaScript TypeOf – How to Check the Type of a Variable or Object in JSThe type of null is the object typeof null ; //'object' In JavaScript, typeof null is an object which gives a wrong impression that, null is an object where it is a primitive value.
https://www.coltsteele.com › tips › identifying-data-types-with-javascript-s-typeof-operator
Identifying Data Types with JavaScript's typeof OperatorIf you run typeof on the value null, it returns "object" due to a historical bug in JavaScript. This is a gotcha, as it doesn't return "null" as you might expect: typeof null; // "object" However, if you use typeof on the undefined value, it returns "undefined": typeof undefined; // "undefined" Using typeof on NaN (Not a Number) returns "number":
https://bitsofco.de › javascript-typeof
"What's the typeof null?", and other confusing JavaScript TypesThe typeof operator in JavaScript evaluates and returns a string with the data type of an operand. For example, to find the type of 123, we would write - typeof 123. This will return a string with the type of 123, which, in this case, will be "number". In addition to "number", the typeof operator can return one of 6 potential results -
