Variables | byexample

In JavaScript, variables are explicitly declared and used by the compiler to check type-correctness of function calls, for example.

const declares a constant binding. It cannot be reassigned.

const name = "byexample";
console.log(name);

let declares a variable that can be reassigned.

let count = 1;
count = 2;
console.log(count);

Variables declared without initialization get the value undefined.

let result;
console.log(result); // undefined

You can also declare and initialize multiple variables in one statement.

let a = 1,
  b = 2;
console.log(a + b);