If Statements

Tact supports if statements in a similar syntax to most programming languages that you're used to. Curly braces are required though, so you can't leave them out.

The condition of the statement can be any boolean expression.

There is no switch statement in Tact. If you need to need to handle a group of outcomes separately, follow the else if pattern you can see in the third example.

All Examples

import "@stdlib/deploy";

contract Loops with Deployable {

    init() {}

    receive("loop1") {
        let sum: Int = 0;
        let i: Int = 0;
        repeat (10) {               // repeat exactly 10 times
            i = i + 1;
            sum = sum + i;
        }
        dump(sum);
    }

    receive("loop2") {
        let sum: Int = 0;
        let i: Int = 0;
        while (i < 10) {            // loop while a condition is true
            i = i + 1;
            sum = sum + i;
        }
        dump(sum);
    }

    receive("loop3") {
        let sum: Int = 0;
        let i: Int = 0;
        do {                        // loop until a condition is true
            i = i + 1;
            sum = sum + i;
        } until (i >= 10);
        dump(sum);
    }

    receive("out of gas") {
        let i: Int = 0;
        while (i < pow(10, 6)) {    // 1 million iterations is too much
            i = i + 1;
        }
        dump(i);
    }
}