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Oussama Moulana
2,977 PointsWhat is an instance and component ?
Hello everyone,
I did almost all JavaScript basics courses, it was great and i'm pretty sure that i understood a lot about arrays and objects. And i'm very happy that i could understand objects here, now i'm trying to learn Vue.js elsewhere since Vue.js courses are not available yet on treehouse.
The problem is the course talk a lot about Instance and sometimes component, and i google it but i'm still not able to visualize that in my mind. Could you please show me some courses here where i can learn more about instance and component, i know there is some on java, but i don't know java ..
If someone could help me or explain me that would be great Thanx
3 Answers
Steven Parker
231,248 PointsThe concept of a component is a small code subset that performs a particular task, perhaps in a generic way that can be useful in more than one program. For examples, you might have a code component that gets temperature information from a weather API, or one that converts a recipe from English to metric units. More elaborate components are sometimes called "widgets" or "plug-ins".
An instance is just a single object that was created from a class. You'd typically use the "new" operator with a constructor function or class name to create an instance. While a class is generic, an instance is specific. For example, you might have a class called "Dog" but create an instance named "Spot".
Oussama Moulana
2,977 PointsOhh I got it. Didn't know Spot the dog before today.
Awesome, I'll check this out.
Steven Parker
231,248 PointsI should've mentioned that "Spot" would be the name of a particular dog. In the US, stories about a dog named "Spot" are generally part of the very first written material a child learns to read.
Oussama Moulana
2,977 PointsYeah i saw some video on youtube, it was funny to say to myself that i'm watching Spot the dog to learn JavaScript Thanx again Steven :)
Oussama Moulana
2,977 PointsOussama Moulana
2,977 PointsThank you for your answer Steven, now i have a pretty nice vision with your explanation about component
For instance i need to know what is a constructor first and then try ton understand, but what is the relation about "Dog" and "Spot"?
Steven Parker
231,248 PointsSteven Parker
231,248 PointsMy point was that a class represents a kind of thing, and an instance a particular thing. So you might have a class named "Dog" that defined the general properties of any dog, but an instance named "Spot" that represents one specific dog.
Did your courses include Object-Oriented JavaScript? Constructors and instances are covered there.