frequencies.js

var args = message.getContent().split(" ");
if (args.length == 1) {
    channel.message(args[0] + " <word>");
    return;
}

var freqs = {};
for (var i = 0; i < args[1].length; i++) {
    var ch = args[1][i];
    if (ch in freqs)
        freqs[ch]++;
    else
        freqs[ch] = 1;
}

var result = "";
for (var ch in freqs) {
    if (result.length != 0)
        result += "\n";
    result += ch + ": " + freqs[ch];
}

channel.message(result);