Scripting: detect layer names -- only first result returned

I have a composition that contains several layers.

Some of the layers are named with "##Q[number]" to mark ##Q1,##Q2,##Q3,##Q4,##Q5 & ##Q6

So when I'm trying to detect if the layers are present, I run the following script:

for (i = 1; i <= mainComposition.numLayers; i++) {
    var layer = mainComposition.layer(i);
    var findIntroLayer = '##Q' + i;
    if (layer.name === findIntroLayer) {
        $.writeln(findIntroLayer + " found!");
    }
}

I only get back:

##Q1 found!

When I do this in a hard-coded way:

if (layer.name == '##Q1') {
    $.writeln("##Q1 found!");
}

if (layer.name === '##Q2') {
    $.writeln("##Q2 found!");
}

...

I get back all the layers I'm targeting.

Don't know why the dynamically created layer name wouldn't work ... any ideas?