All strings [a-z]+ of length N or less, in lexicographic order

gistfile1.js

function gen(N) {
    var strings = [];
    var max = Math.pow(36, N);
    for(var i = 10; i < max; i++) {
        var candidate = i.toString(36);
        if(/^[a-z]+$/.test(candidate)) {
            strings.push(candidate);
        }
    }
    return strings;
}