TryCF Gist

trycf-gist-1618528927498-c8b1bee8-232c-a42d-8192-9914e0b0342a.cfm

<cfscript>
    function chunk(arr, sz) {
        var out = [];
        var ceil = ceiling(arr.len() / sz)
        for(var i = 1; i <= ceil; i++) out.append(i == ceil ? arr.slice(1 + (i - 1) * sz, arr.len() - ((i - 1) * sz)) : arr.slice(1 + (i - 1) * sz, sz));
        return out;
    }

    function chunk2 (required array input, required numeric chunkSize) {
        var output = [];
        output[1]= [];
        var currentChunk = 1;
        input.each((item, index) => {
            output[currentChunk].append(item);
            if(index % chunkSize == 0 && index < input.len()) output[++currentChunk] = [];
        })
        return output;
    }   

    function chunk3(arr, sz) {
        var out = [];
        var ceil = ceiling(arr.len() / sz);
        for(var i = 1; i <= ceil; i++) {
            var t = [];
            var offset = (i - 1) * sz;
            if(i == ceil){
                var c = arr.len() - offset < sz ? arr.len() - offset : sz;
                for(var x = 1; x <= c; x++) t.append(arr[offset + x]);
            }
            else {
                for(var x = 1; x <= sz; x++) t.append(arr[offset + x]);
            }
            out.append(t);
        }
        return out;
    }
    
    arr = [];
    for(total = 1; total <= 100000; total++) arr[total] = total;

    start = getTickCount();
    chunk(arr, 25);
    dump("chunk " & getTickCount() - start);
    
    start = getTickCount();
    chunk2(arr, 25);
    dump("chunk2 " & getTickCount() - start);

    start = getTickCount();
    chunk3(arr, 25);
    dump("chunk3 " & getTickCount() - start);

</cfscript>