Programming

What does “scope” mean?

The scope of a variable is the part of a script that defines the variable and in which it can be referenced. There are two main types of scope: global and local.

Global Scope

The global scope is all of the script that is not inside a function, if statement, or other conditional structure. Code from anywhere in the script can access global variables. There is only one global scope.

Local Scope

Code that is inside a function or in any local block (one that is inset by four spaces) defines a local scope. Only code that is in the same local scope can access a local variable. There can be many local scopes.

Is Lipi Script an Object-Oriented Language?

Although Lipi Script is not strictly an object-oriented programming language, it includes certain object-oriented characteristics, such as user-defined types (UDTs). Scripts can create objects as instances of a UDT. These objects consist of one or more fields that can store values of various data types.

Here is a simple example of using the type keyword to create an object:

indicator("Object demo")
 
// Define a new type named `pivot`.
type pivot {
    int   x
    float y
    bool  isHigh
}
// Create a new `pivot` with specific values.
pivot newPivot = pivot.new(bar_index, close, true)
 
// Plot the `y` component of `newPivot`.
plot(newPivot.y)

In this example, we create an object newPivot, which is an instance of the user-defined type pivot. The script then plots the y field of newPivot.