Blocks

User Guide > General > MEL and Expressions > Syntax >

Blocks

A block is a group of expressions that can stand in for a single expression. Blocks are surrounded by curly braces:

	print("Hello there.");

	print("Glad to meet you.");

	print("So long!");

For example, the if statement has this form:

if (condition)

	exp1

exp1 can be a single expression:

if ($x > 5)

	print("It's more than 5!");

...or a block of expressions:

if ($x > 5) {

	print("It's more than 5!");

	$x = 0;

	$y++;

Blocks will become important when you start to use conditional and looping statements.

Very important note

In MEL, unlike most languages, all statements inside a block (surrounded by curly braces) must end in semicolons, even if it is the only statement in the block.

if ($s > 10) {print("Glonk!")} // Syntax error.

if ($s > 10) {print("Glunk!");} // Notice the semicolon.

Variable scope in blocks

Blocks can also be useful to limit the scope of a variable, since any local variable declared in a block is only visible inside that block:

int $test = 10;

	int $test = 15;

	print($test+"\n");

print($test+"\n");

// Result: