Vidéos
https://code-garage.fr › blog › quelles-sont-les-differences-entre-var-let-et-const-en...
Quelles sont les différences entre var, let et const en Javascriptvar: oui ️; let: oui ️; const: non ; Réassigner signifie que l'on va soit modifier la valeur de la variable lorsque l'on joue avec les types primitifs, soit que l'on va modifier la référence de la variable lorsque l'on utilise un type complexe.
var: oui ️; let: oui ️; const: non ; Réassigner signifie que l'on va soit modifier la valeur de la variable lorsque l'on joue avec les types primitifs, soit que l'on va modifier la référence de la variable lorsque l'on utilise un type complexe.
https://www.freecodecamp.org › news › var-let-and-const-whats-the-difference
Var, Let, and Const – What's the Difference? - freeCodeCamp.orgLearn how var, let, and const differ in JavaScript variable declaration with examples. Compare their scope, use, and hoisting behaviors and advantages and disadvantages.
https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Statements › let
let - JavaScript | MDN - MDN Web DocsL'instruction let permet de déclarer une variable dont la portée est celle du bloc courant, éventuellement en initialisant sa valeur. Exemple interactif. Syntaxe. js. let var1 [= valeur1] [, var2 [= valeur2]] [, …, varN [= valeurN]]; Paramètres. var1, var2, …, varN. Le nom de la ou des variables.
https://laconsole.dev › blog › differences-let-var-const-js
Différences entre Let, Var et Const en JavaScript - laConsoleDans cet article, nous allons explorer les différentes façons de déclarer des variables en JavaScript, en mettant l’accent sur les trois mots-clés principaux : let, var et const.
https://www.freecodecamp.org › news › differences-between-var-let-const-javascript
var, let, and const in JavaScript – the Differences Between These ...var and let create variables that can be reassigned another value. const creates "constant" variables that cannot be reassigned another value. developers shouldn't use var anymore. They should use let or const instead. if you're not going to change the value of a variable, it is good practice to use const.
https://www.w3schools.com › JS › js_let.asp
JavaScript Let - W3SchoolsES6 introduced the two new JavaScript keywords: let and const. These two keywords provided Block Scope in JavaScript: Example. Variables declared inside a { } block cannot be accessed from outside the block: { let x = 2; } // x can NOT be used here. Global Scope. Variables declared with the var always have Global Scope.
https://stackoverflow.com › questions › 762011
javascript - What is the difference between "let" and "var"? - Stack ...Variables declared by var keyword are scoped to the immediate function body (hence the function scope) while let variables are scoped to the immediate enclosing block denoted by { } (hence the block scope).
https://www.w3schools.com › js › js_variables.asp
JavaScript Variables - W3SchoolsWhen to Use var, let, or const? 1. Always declare variables. 2. Always use const if the value should not be changed. 3. Always use const if the type should not be changed (Arrays and Objects) 4. Only use let if you can't use const. 5. Only use var if you MUST support old browsers.
https://www.freecodecamp.org › news › javascript-variables-beginners-guide
JavaScript Variables – A Beginner's Guide to var, const, and letIn JavaScript, you can declare variables by using the keywords var, const, or let. In this article, you’ll learn why we use variables, how to use them, and the differences between const, let and var.
https://pauldcoder.hashnode.dev › let-vs-const-vs-var-when-and-how-to-use-them
let vs. const vs. var - When and How to Use Them - CodeSpckLet's go through the differences between let, const, and var in JavaScript and understand when it's best to use each one.
