How can I get a list of the differences between two JavaScript object graphs?

Question

I want to be able to get a list of all differences between two JavaScript object graphs, with the property names and values where the deltas occur.

For what it is w

Answer 1

None of the libraries I found were sufficient so I wrote my own AngularJS factory. It compares the objects in both ways and returns only the difference within the same structure.

/**
 * Diff
 * Original author: Danny Coulombe
 * Creation date: 2016-05-18
 * 
 * Work with objects to find their differences.
 */
controllers.factory('diff', [function() {

    var factory = {

        /**
         * Compare the original object with the modified one and return their differences.
         * 
         * @param original: Object
         * @param modified: Object
         * 
         * @return Object
         */
        getDifferences: function(original, modified) {

            var type = modified.constructor === Array ? [] : {};
            var result = angular.copy(type);
            var comparisons = [[original, modified, 1], [modified, original, 0]];

            comparisons.forEach(function(comparison) {

                angular.forEach(comparison[0], function(value, key) {

                    if(result[key] === undefined) {

                        if(comparison[1][key] !== undefined && value !==    null && comparison[1][key] !== null && [Object, Array].indexOf(comparison[1][key].constructor) !== -1) {

                            result[key] = factory.getDifferences(value, comparison[1][key]);
                        }
                        else if(comparison[1][key] !== value) {

                            result[key] = comparison[comparison[2]][key];
                        }

                        if(angular.equals(type, result[key])
                        || result[key] === undefined
                        || (
                            comparison[0][key] !== undefined
                            && result[key] !== null
                            && comparison[0][key] !== null
                            && comparison[0][key].length === comparison[1][key].length
                            && result[key].length === 0
                        )) {
                            delete result[key];
                        }
                    }
                });
            });

            return result;
        }
    };

    return factory;
}]);