What is property in javascript?

JavaScript
1

I am trying to understand objects and I do not understand what it means when the word property is used? I know what is key and values are but what is property?

1 Like
2

A property is the association between an object key and its value, similar to how a variable is the association between a name and a value. So if you have an object like let x = {foo: 123}, then “the x.foo property” is referring to the pair of the key “foo” and its value 123. Think of a property as the named box that values go in.

It’s a bit of an ambiguous term: sometimes people will use it when they just mean “key”, sometimes when they mean the value that belongs to the key.

3

The Javascript language uses both. So we have Object.keys() but also Object.hasOwnProperty() - both referring to the key or keys of an object and not to the values.

Property is also used when talking about a class and is used in contrast to method. So strictly speaking, you could say that a property is any key of an object which is not a function.

4

Hard to understand if everything is a property.
If you look an object as an keys:values elements therefor the keys are the propertys. It’s also considered as the state value of the objects.These property can change(person_weight, car_color,…). JavaScript consider the method as property too where other Oriented Object langages like Java make a separation between then. So what I understand is that: property is something that define the object

5

so e.g.

let my Obj = {
  name: "Ammar"
}

name is the key and property (interchangeable names) or the whole name: "Ammar" is property?

6

MDN is your best resource for JavaScript questions:

http://forum.freecodecamp.org/t/what-is-property-in-javascript/275934/4

Looks like chuckadams was right. Formally a property consists of a property name and property value, which are equivalent to an object key and object value.