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HTML / CSS / JS

// Numeric enum — auto-increments from 0
enum Direction {
    North,   // 0
    East,    // 1
    South,   // 2
    West,    // 3
}

console.log(Direction.North); // 0
console.log(Direction[0]);    // "North" — reverse mapping

// Custom start value
enum HttpStatus {
    Ok          = 200,
    Created     = 201,
    BadRequest  = 400,
    Unauthorized = 401,
    NotFound    = 404,
    ServerError = 500,
}

// String enum — preferred for readability
enum LogLevel {
    Debug   = "DEBUG",
    Info    = "INFO",
    Warning = "WARNING",
    Error   = "ERROR",
}

function log(level: LogLevel, message: string): void {
    console.log(`[${level}] ${message}`);
}

log(LogLevel.Info, "Server started");
log(LogLevel.Error, "Unhandled exception");

// Enum as a type
function isError(level: LogLevel): boolean {
    return level === LogLevel.Error;
}

console.log(isError(LogLevel.Warning)); // false