In Angular, the distinction between pure and impure pipes is crucial for understanding how data transformations are handled within the framework. Here's a detailed explanation of the differences:
Pure Pipes
Execution Trigger: Pure pipes are executed only when Angular detects a change in the value or the parameters passed to a pipe. This change must be a change in a primitive data type (like string, number, etc.) or a change in object reference[1][2][3][4].
Performance: Since pure pipes are only executed when there is an actual change to the input, they are generally more performance-efficient. They do not recompute on every change detection cycle, which minimizes unnecessary computations[1][2][3][4].
Instance Management: A single instance of a pure pipe is created and reused across the component, which further contributes to performance efficiency[2].
Use Case: Pure pipes are ideal for simple transformations that depend solely on the input values and do not require any external state or frequent updates based on other changes in the application[1][2][3][4].
Impure Pipes
Execution Trigger: Impure pipes are executed on every change detection cycle, regardless of whether the input value has changed or not. This means they will recompute even if the input data remains the same[1][2][3][4].
