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JavaScript provides three ways to declare variables: var, let, and const. These keywords differ in scope, hoisting behavior, and reassignment rules.
var
Scope: Variables declared with var are either function-scoped or global-scoped, depending on where they are declared.
Hoisting: var variables are hoisted to the top of their scope and initialized with undefined. This means they can be accessed before their declaration without throwing an error.
Re-declaration: Variables can be re-declared and updated within the same scope.
Usage Example:
console.log(x); // undefined (hoisted)var x = 5;console.log(x); // 5Gekopieerd.āKopiërenlet
Scope: let is block-scoped, meaning the variable is only accessible within the block {} where it is declared.
Hoisting: let variables are hoisted but remain in the Temporal Dead Zone (TDZ) until their declaration is encountered. Accessing them before declaration throws a ReferenceError.
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