/*
Title: Enumeration of Constants in JavaScript
Example with and without explicit values
*/
// JavaScript does not have native enums, but we can simulate them using objects.
// Enum WITHOUT explicit values (simulated using auto‑increment logic)
const Color = {
RED: 0,
GREEN: 1,
BLUE: 2
};
console.log("Enum without explicit values:");
console.log("RED =", Color.RED);
console.log("GREEN =", Color.GREEN);
console.log("BLUE =", Color.BLUE);
// Enum WITH explicit and mixed values
const Status = {
OK: 1,
WARNING: 5,
ERROR: 6, // manually assigned (simulating auto-increment)
CRITICAL: 10
};
console.log("\nEnum with explicit and mixed values:");
console.log("OK =", Status.OK);
console.log("WARNING =", Status.WARNING);
console.log("ERROR =", Status.ERROR);
console.log("CRITICAL =", Status.CRITICAL);
// Using Object.freeze() to make enum immutable (recommended)
const FrozenDays = Object.freeze({
SUNDAY: 0,
MONDAY: 1,
TUESDAY: 2
});
console.log("\nImmutable enum example:");
console.log("SUNDAY =", FrozenDays.SUNDAY);
// Attempt to modify (will fail silently or throw in strict mode)
FrozenDays.SUNDAY = 99;
console.log("After modification attempt, SUNDAY =", FrozenDays.SUNDAY);
/*
run:
Enum without explicit values:
RED = 0
GREEN = 1
BLUE = 2
Enum with explicit and mixed values:
OK = 1
WARNING = 5
ERROR = 6
CRITICAL = 10
Immutable enum example:
SUNDAY = 0
After modification attempt, SUNDAY = 0
*/
