Getting started with Flow.apex

If Block

Flow.apex supports if and if not blocks.

Flow f = new Flow()
    .inputAs('a', 'b').returnInteger()
    .doIf(
        'a == 1',
        Flow.block().doReturn(1)
    );

And we can append the else block too.

Flow f = new Flow()
    .inputAs('a', 'b').returnInteger()
    .doIf(
        'a == 1',
        Flow.block().doReturn(1),
        Flow.block().doReturn(2)
    );

Here if needs at least one block. A block in Flow.apex is actually a block of executable statements. We can use the blocks to extend our logic.

Flow f = new Flow()
    .inputAs('a', 'b').returnInteger()
    .doIf(
        'a == 1',
        Flow.block()
            .var('b = 2')
            // more logic goes on here
            .doReturn(1)
    );
Done