One option could be letting your custom class implement the Serializable interface and then you can pass object instances in the intent extra using the putExtra(Serializable..) variant of the Intent#putExtra() method. Actual Code: In Your Custom Model/Object Class: public class YourClass implements Serializable { At other class where using the Custom Model/Class: //To pass: intent.putExtra(“KEY_NAME”, … Read more
Why reinvent the wheel? Give Lodash a try. It has a number of must-have functions such as isEqual(). _.isEqual(object, other); It will brute force check each key value – just like the other examples on this page – using ECMAScript 5 and native optimizations if they’re available in the browser. Note: Previously this answer recommended Underscore.js, … Read more
Create a copy constructor: class DummyBean { private String dummy; public DummyBean(DummyBean another) { this.dummy = another.dummy; // you can access } } Every object has also a clone method which can be used to copy the object, but don’t use it. It’s way too easy to create a class and do improper clone method. … Read more
There are two ways to access properties of an object: Dot notation: something.bar Bracket notation: something[‘bar’] The value between the brackets can be any expression. Therefore, if the property name is stored in a variable, you have to use bracket notation: var something = { bar: ‘foo’ }; var foo = ‘bar’; // both x … Read more
(name is undefined) You: What is name? (*) JavaScript: name? What’s a name? I don’t know what you’re talking about. You haven’t ever mentioned any name before. Are you seeing some other scripting language on the (client-)side? name = null; You: What is name? JavaScript: I don’t know. In short; undefined is where no notion … Read more
Move them to an array, sort that array, and then use that array for your purposes. Here’s a solution: let maxSpeed = { car: 300, bike: 60, motorbike: 200, airplane: 1000, helicopter: 400, rocket: 8 * 60 * 60 }; let sortable = []; for (var vehicle in maxSpeed) { sortable.push([vehicle, maxSpeed[vehicle]]); } sortable.sort(function(a, b) … Read more
Just use the sys.getsizeof function defined in the sys module. sys.getsizeof(object[, default]): Return the size of an object in bytes. The object can be any type of object. All built-in objects will return correct results, but this does not have to hold true for third-party extensions as it is implementation specific. Only the memory consumption … Read more
for in loops over enumerable property names of an object. for of (new in ES6) does use an object-specific iterator and loops over the values generated by that. In your example, the array iterator does yield all the values in the array (ignoring non-index properties).
Preliminaries JavaScript has only one data type which can contain multiple values: Object. An Array is a special form of object. (Plain) Objects have the form {key: value, key: value, …} Arrays have the form [value, value, …] Both arrays and objects expose a key -> value structure. Keys in an array must be numeric, … Read more
I would recommend using JSON.stringify, which converts the set of the variables in the object to a JSON string. var obj = { name: ‘myObj’ }; JSON.stringify(obj); Most modern browsers support this method natively, but for those that don’t, you can include a JS version.