Page Comparison

function evaluate(answers) {
    // preprocess user answers - remove embedded white spaces, and convert to lower case, based on the config
    answers = _.map(answers, function (a) {
        var ans = a;
        if (qData.config.eval_ignore_whitespaces)
            ans = ans.trim().replace(/\s/g, '');
        if (qData.config.eval_ignore_case)
            ans = ans.toLowerCase();
        return ans;
    });

    // get user answer indices. (this is the index in the expAnswers array in which a match is found, 
    // -1 if no match found)
    var userAnsIndices = _.map(answers, function (answer) {
        return _.findIndex(qData.data.data.expAnswers, function (expAns) {
            return _.contains(expAns, answer);
        });
    });

    // Sort the userAnsIndices array elements in case if unordered evaluation
    if (qData.config.eval_unordered)
        userAnsIndices = _.sortBy(userAnsIndices, function (u) { return u });

    // if the userAnsIndices are found in the expAnsIndices, then the question is sovled!
    var isSolved = _.some(qData.data.data.expAnsIndices, function (expAns) {
        return _.isEqual(expAns, userAnsIndices);
    });
    var score = isSolved ? userAnsIndices.length : 0;
	// compute partial score, if partial scoring is enabled in config
    if (!isSolved && qData.config.partial_score) {
        var scoreMap = _.map(userAnsIndices, function (u, i) {
            return _.some(qData.data.data.expAnsIndices, function (expAns) {
                return qData.config.eval_unordered ? _.contains(expAns, u) : (expAns[i] == u);
            }) ? 1 : 0;
        });
        score = _.reduce(scoreMap, function (memo, num) { return memo + num; }, 0);
    }
    console.log('Solved', isSolved);
    console.log('Score', score / userAnsIndices.length);
}