var arrayDiffByKey = function()

in pytheas-core/src/main/resources/js/jsondiffpatch.js [97:151]

• 42 lines of code
• 10 McCabe index (conditional complexity)

    var arrayDiffByKey = function(o, n, itemKey){
        var adiff, ol = o.length, nl = n.length, getKey, dcount = 0;
        
        if (typeof itemKey == 'function') {
            getKey = itemKey;
        }
        else {
            getKey = function(item){
                return item[itemKey];
            }
        }
        
        for (var i = 0; i < nl; i++) {
            if (typeof adiff == 'undefined') {
                adiff = {
                    _t: 'a'
                };
            }
            // added, changed or unchanged
            adiff[getKey(n[i])] = [n[i]];
            dcount++;
        }
        for (var i = 0; i < ol; i++) {
            var key = getKey(o[i]);
            if (typeof adiff == 'undefined' || typeof adiff[key] == 'undefined') {
                if (typeof adiff == 'undefined') {
                    adiff = {
                        _t: 'a'
                    };
                }
                // deleted
                adiff[key] = [o[i], 0, 0];
                dcount++;
            }
            else {
                var d = diff(o[i], adiff[key][0]);
                if (typeof d == 'undefined') {
                    // unchanged
                    delete adiff[key];
                    dcount--;
                }
                else {
                    // changed
                    adiff[key] = d;
                }
            }
        }
        if (dcount > 0) {
            return adiff;
        }
        else {
            // no changes
            return;
        }
    };