Variables and Constants

Constant can be created using const and variable can be created using let.

Sample:

function main() {
  const constant = 10;
  // constant = 12 // Error, Cannot assign to 'constant' because it is a constant.
  console.log(constant);
  const object = {
    name: "deepak",
  };
  object.name = "updated"; // No Error in updating property

  // object = {} // Error, Cannot assign to 'object' because it is a constant.
  // Cant change reference

  // Same for Array

  const array = [10, 12];
  array[0] = 12;

  // array = [] // Error
  // Cant change reference

  let variable = 10;
  variable = 12; // No issue

  let arrVar = [12];
  arrVar = [];
}
main();

More:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const

How to run example:

deno run examples/05_variables_constants.ts