Control Flow Formatting Rules

§5 Control Flow

§5.1 if Expression. A space separates the if keyword from the condition, and a space separates the condition from the code block.

// ✅ Correct
if condition { ... }

// ❌ Incorrect
if(condition) { ... }
if condition{ ... }

§5.2 else if/else. A space separates else if and else from the previous code block.

// ✅ Correct
if a > 0 { ... } else if a < 0 { ... } else { ... }

// ❌ Incorrect
if a > 0 { ... }else if a < 0 { ... }else { ... }

§5.3 for Loop. A space separates the for keyword, variable, in keyword, and iterator.

// ✅ Correct
for item in collection { ... }

// ❌ Incorrect
for item in(collection) { ... }
for(item) in collection { ... }

§5.4 while Loop. A space separates the while keyword from the condition.

// ✅ Correct
while condition { ... }

// ❌ Incorrect
while(condition) { ... }

§5.5 Loop Labels. The label connects to the loop keyword with : .

// ✅ Correct
'outer: for i in range(10) { ... }

// ❌ Incorrect
'outer:for i in range(10) { ... }
'outer : for i in range(10) { ... }

§5.6.1 Return Format. A space separates the return keyword from the expression.

// ✅ Correct
return 42;
return x + y;

// ❌ Incorrect
return(42);  // Missing space
return  42;  // Extra space

§5.6.2 Empty Return. An empty return uses the return keyword directly.

// ✅ Correct
return;

// ❌ Incorrect
return ;  // Extra space
return void;  // void not needed

§5.7.1 Break Format. A space separates the break keyword from the label.

// ✅ Correct
break;
break 'outer;

// ❌ Incorrect
break(outer);  // Wrong syntax
break  'outer;  // Extra space

§5.8.1 Continue Format. A space separates the continue keyword from the label.

// ✅ Correct
continue;
continue 'outer;

// ❌ Incorrect
continue(outer);  // Wrong syntax
continue  'outer;  // Extra space