gistfile1.js

// A weird mixture between functional and imperative.
// I like putting some lambdas into their own functions, for some
// degree of self-documenting and readability later on.

// ...

var nodes, fontnames, firstpick,
    result = false;

function isEditableTextnode(node) {
    return isEditable(node) && node.nodeType == Node.TEXT_NODE;
}

// original parameter order makes currying unusable
function node2fontname(node) {
    return getEffectiveValue(node, "fontname");
}

var nodes = collectAllEffectivelyContainedNodes(getActiveRange(), isEditableTextnode);

// Pattern matching for the poor ...
if (nodes.length <= 1) {
    return result;
} else {
    fontnames = nodes.map(node2fontname);
    firstpick = fontnames.shift();
    
    result    = fontnames.some(function (nextpick) {
        // some is short-circuiting. Should be.
        return nextpick !== firstpick;
    });
}

return result;