2.4 Understanding Variable Declarations in Pine Script

In this video, Paul delves into variable declarations in Pine Script. He explains how to assign values to variables for easier and efficient use throughout your script. Paul demonstrates how to access historical variable context and emphasizes the case sensitivity and uniqueness of variable names. He introduces various data types, such as integers, floats, booleans, strings, and user-defined types, providing insight into recasting values for better understanding and fewer errors. By the end of this segment, you’ll have a clear grasp of working with variables in Pine Script for smoother scripting.

Understanding Variable Declarations in Pine Script


In this segment, we’ll delve into the realm of variable declarations in Pine Script. Variables are essential for storing and reusing values throughout your script.

Key Points:

Let’s explore the fundamental aspects of working with variables:

Declaring Variables:

Suppose you have a value you’ll be using repeatedly in your script. Instead of typing it out each time, assign it to a variable. For example, assigning the value 1 to a variable called “myVar” lets you use “myVar” instead of 1.

Case Sensitivity and Uniqueness:

Variable names in Pine Script are case-sensitive and must be unique. Attempting to assign a new value to an existing variable will result in an error. To reassign a value, use the walrus operator :=

Accessing Historical Context:

By utilizing the history operator [], you can access the previous value of a variable. This is useful for tracking changes over time.

Dynamic Typing:

Pine Script uses dynamic typing, meaning you don’t need to specify a data type when assigning a value to a variable. The type is inferred automatically.

Common Data Types:

Pine Script offers common data types such as integers, floats, booleans, colors, and strings. Additionally, specialized types like line, fill, label, box, and table enhance script functionality.

User-Defined Types:

Pine Script enables you to create your own custom data types, providing flexibility beyond the predefined options.


Variable declarations are at the core of efficient Pine Script scripting. Understanding how to declare, assign, and manage variables will empower you to create more organized and effective scripts.

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