FAQ: Introduction to JavaScript - Review

This community-built FAQ covers the “Review” exercise from the lesson "Introduction to JavaScript ".

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This exercise can be found in the following Codecademy content:

Web Development

Introduction To JavaScript

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This review talks about properties and methods of objects. On the surface (judging by how they look in the code), these look very much alike. the only difference I can spot is that a property like .length lacks the parantheses that a method like .toUpperCase() has.
What’s the exact difference between properties of an object and its methods?
Is there one on a technical level (the computer does different things with either) or is it a rather “human” distinction (only we can tell the difference, the computer can’t)?

I was asking myself the same thing yesterday. I found a post on a website that made me understand

" Think of an object as an object in real life (such as a bicycle). A method is something you can do with the bike (pedal), or something you can do to the bike (re-inflate tire). A property is something about the bike: how many wheels it has (wheels) or its height (height).

Object: Bicycle Properties:

** wheels*
** height*
** price*
** radius of wheel *

Methods:
** repair*
** pedal*

Hope this helps."-ammonquackenbush

https://teamtreehouse.com/community/difference-between-object-methods-and-object-properies

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What is an instance of a datatype? What is meant by instance?

In the review page it reads

  • Objects, including instances of data types, can have properties, stored information. The properties are denoted with a . after the name of the object, for example: 'Hello'.length .
  • Objects, including instances of data types, can have methods which perform actions. Methods are called by appending the object or instance with a period, the method name, and parentheses. For example: 'hello'.toUpperCase() .
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A property is like a noun.
A method is like a verb.

A method is a function…but it’s a function defined within an object. As opposed to a function made “outside” of that object.

When you see something like: shoes.length = 0
The assignment operator (=) is a good indicator it’s a property.

When you see function() {}. or () => {}
that’s a sign it’s a function and if it’s inside of an object, it’s a method.

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i’m doing the webdevelopment course and want to redo the first java lesson, just to understand it better. is there a way to only reset this lesson? as far as i can see the only option offered is to start from scratch alltogehter… thx for any tip.

I came here with the same question. Do you know the answer now?