![]() They can neither be redeclared nor be reassigned. It cannot be redeclared but can be reassigned a value.Ĭonst in JavaScript is used to declare a fixed value that cannot be changed over time once declared. var is function scoped, let is block scoped. Let in JavaScript is similar to var only difference lies in the scope. It can be function scoped or globally scoped. It can be initialized to a value, redeclared and its value can be reassigned, but only inside the context of a function. Var is the most commonly used variable in JavaScript. JavaScript allows the usage of variables in the following three ways: Variable Variables: Variables in JavaScript are containers for storing data.
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