Getting element from an array where data may not exist

Question

I am trying loop over elements in an array

data = [];

data[3] = true;
data[4] = false;

for (i = 1; i <= data.len(); i++) {
    if(data[i])   {
        writeoutput("Kittens!")
    }
}

And I get an error

Not an option

My code is a simplification of larger process. The following is NOT an option

for (datum in data) {
    if(datum)   {
        writeoutput("Kittens!")
    }
}

Answer 1

You could always channel The King...

<cfscript>
data = [];

data[3] = true;
data[4] = false;



for (i = 1; i <= data.len(); i++) {

    if( data[i]?:false )   {
        writeoutput("Kittens!");
    }
    else { writeoutput("nope"); }
}


</cfscript>

https://trycf.com/gist/d8664be620520252871e91796bef2f61/acf2016?theme=monokai