https://www.w3schools.com › js › js_typeof.asp
JavaScript typeof - W3SchoolsThe typeof operator returns the type of a variable or an expression. Examples. typeof "John" // Returns string. typeof ("John"+"Doe") // Returns string. typeof 3.14 // Returns number. typeof 33 // Returns number. typeof (33 + 66) // Returns number. typeof true // Returns boolean. typeof false // Returns boolean. typeof 1234n // Returns bigint.
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 JSLearn how to use the typeof operator to get the type of any value in JavaScript, and the common gotchas and limitations of this operator. Also, explore better ways to do type checking with instanceof, Object.prototype.toString, and other methods.
https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Operators › typeof
L'opérateur typeof - JavaScript | MDN - MDN Web DocsAvec l'apparition des opérateurs let et const, si on utilise typeof sur des variables déclarées avec ces opérateurs (ou avec une classe) avant leur déclaration, cela déclenchera une erreur ReferenceError.
https://developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Operators › typeof
typeof - JavaScript | MDN - MDN Web DocsThe typeof operator returns a string indicating the type of the operand's value.
https://stackoverflow.com › questions › 4456336
Finding Variable Type in JavaScript - Stack OverflowIn Java, you can use instanceOf or getClass() on a variable to find out its type. How do I find out a variable's type in JavaScript which isn't strongly-typed? For example, how do I know if the b...
https://www.delftstack.com › fr › howto › javascript › javascript-get-type
Obtenir le type d'une variable en JavaScript | Delft StackUtilisation de l’opérateur typeof pour trouver le type de variable. typeof est un opérateur unaire en javascript qui renvoie le type d’un opérande auquel il est appliqué. Il renvoie généralement le type de variable sous forme d’objet chaîne. Il existe des types de retour standard pour l’opérateur typeof en javascript.
https://www.javascripttutorial.net › javascript-typeof
JavaScript typeofIn this tutorial, you'll learn how to use the JavaScript typeof operator that returns a string representing the type of a value.
Syntax. The typeof operator is followed by its operand: typeof operand. Parameters. operand is an expression representing the object or primitive whose type is to be returned. Description. The following table summarizes the possible return values of typeof.
https://blog.logrocket.com › javascript-typeof-2511d53a1a62
JavaScript typeof : Understanding type checking in JavaScriptWith JavaScript, it is possible to have a variable that started off as containing a string, and much later in its lifecycle, has become a reference to an object. There are even times when the JavaScript engine implicitly coerces the type of a value during script execution. Type checking is very critical to writing predictable JavaScript programs.
https://masteringjs.io › tutorials › fundamentals › typeof
The `typeof` Operator in JavaScript - Mastering JSThe typeof Operator tells you the type of a value - whether the value is a number, string, object, etc. Here's what you need to know.
