https://code-garage.fr › blog › quelles-sont-les-differences-entre-var-let-et-const-en...

Mais depuis la version 6 (ECMAScript 2015) de la spécification du langage, deux nouveaux mot-clés sont apparus : let et const. Si l'on devait résumer la définition de ces deux nouvelles manières de déclarer des variables, on pourrait dire que : let sert à définir une variable locale; const sert à déclarer une référence constante

https://www.freecodecamp.org › news › var-let-and-const-whats-the-difference

var declarations are globally scoped or function scoped while let and const are block scoped. var variables can be updated and re-declared within its scope; let variables can be updated but not re-declared; const variables can neither be updated nor re-declared.

https://stackoverflow.com › questions › 22308071

The let and const. ES6 let allows you to declare a variable that is limited in scope to the block (Local variable). The main difference is that the scope of a var variable is the entire enclosing function:

https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Statements › let

L'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://www.freecodecamp.org › news › differences-between-var-let-const-javascript

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. The first two points are likely pretty self-explanatory.

https://dev.to › codeparrot › javascript-var-vs-let-vs-const-key-differences-best-uses-17e7

In this blog, we've explored the key differences between var, let, and const—the three primary ways to define variables in JavaScript. We've seen how var is function-scoped and hoisted, but its quirks can lead to unintended behavior. On the other hand, let and const, introduced in ES6, offer block-scoping and greater predictability ...

https://stackabuse.com › the-difference-between-var-let-and-const-in-javascript-and-best...

Learn the difference between var, let and const in JavaScript, and how they affect variable scope and availability. See examples, advantages and disadvantages of each keyword, and when to use them.

https://playcode.io › javascript › let-const

Learn about the new JavaScript keywords let and const introduced in ES6. We will discuss the differences between them and why they are important.