Counter and Theme Toggle - Hack Typing CST Test

Counter and Theme Toggle — Hack Code

Demonstrates a simple counter with theme toggling using Hack variables, functions, and conditional statements.

<?hh

<<__EntryPoint>>
function main(): void {
	$counter = 0;
	$isDark = false;

	function updateUI(): void {
		global $counter, $isDark;
		echo "Counter: $counter\n";
		echo "Theme: " . ($isDark ? "Dark" : "Light") . "\n";
	}

	function increment(): void {
		global $counter;
		$counter += 1;
		updateUI();
	}

	function decrement(): void {
		global $counter;
		$counter -= 1;
		updateUI();
	}

	function reset(): void {
		global $counter;
		$counter = 0;
		updateUI();
	}

	function toggleTheme(): void {
		global $isDark;
		$isDark = !$isDark;
		updateUI();
	}

	// Simulate actions
	updateUI();
	increment();
	increment();
	toggleTheme();
	decrement();
	reset();
}

Hack Language Guide

Hack is a programming language developed by Facebook as a dialect of PHP. It adds static typing, enhanced performance, and modern programming features while maintaining compatibility with PHP, enabling rapid development of large-scale web applications.

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