deepEquals.js

// check if two values are equals (deep check)
function deepEquals(value, other) {
	// first, check type
	var areEquals = typeof value === typeof other;
	
	if (areEquals) {
		if (value instanceof Array && other instanceof Array) { // handle arrays
			areEquals = other.length === value.length;
			
			if (areEquals) {
				value.forEach(function (rec, i) {
					return areEquals = deepEquals(value[i], other[i]);
				});
			}
		} else if (typeof value === 'object') { // handle objects
			// check object class
			areEquals = other.constructor === value.constructor;
			
			if (areEquals) {
				var key, keys = [];
				
				for (key in value) {
					areEquals = deepEquals(value[key], other[key]);
					
					if (!areEquals) break;
					
					keys.push(key);
				}
				
				// we have to process both variables
				// the second object may have more properties
				if (areEquals) {
					for (key in other) {
						if (keys.indexOf(key) === -1) {
							areEquals = deepEquals(value[key], other[key]);

							if (!areEquals) break;
							
							keys.push(key);
						}
					}
				}
			}
		} else {
			// otherwise, strict comparison
			areEquals = value === other;
		}
	}
	
	return areEquals;
}