Function compareGroup

docs/app/js/sanddance-app.js:6125–6137

(a, b)

    clause: null
});
function compareGroup(a, b) {
    for(let k = 0; k < groupKeys.length; k++){
        let key = groupKeys[k];
        if (a[key] != b[key]) return false;
    }
    if (!a.expressions && !b.expressions) return true;
    if (!a.expressions || !b.expressions) return false;
    if (a.expressions.length != b.expressions.length) return false;
    for(let i = 0; i < a.expressions.length; i++){
        if (!compareExpression(a.expressions[i], b.expressions[i])) return false;
    }
    return true;
}
function compare(a, b) {
    if (a == b) return true;
    if (!a || !b) return false;