Decisions and blocks

Choose between two values

?: selects the first result when its condition succeeds; ?_ selects the other result when it fails. This returns 4.

Runnable RiXRun cell

x := -4; x > 0 ?: x ?_ -x;

Test x := 4 as well. The Ternaries and cases lesson covers several branches and the distinct undecided ? result.

Group calculations

{; ... } groups statements and returns its final value. The following block returns 6.

Runnable RiXRun cell

{; width := 2; height := 3; width * height };

Brace containers explains the other sigils and later loop mechanics. Loops that update state are best read after Cells and assignment; Bounded simulation uses both. Deferred execution is an advanced continuation.

Continue with Functions and scope to reuse a decision.