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In Angular, Pipes can be of two types,
1. Pure pipes
These are the pipes which helps angular to optimize the performance.
The pure pipes does not invoke their transform method unless the input value change
The angular runs the Change Detection Cycle for every action taken by the user, as pure pipes does not executes their transform method until the input value changes it helps to improve the performance
2. Impure pipes
These are the pipes which does not help angular to improve the performance as they execute their transform method regardless of the input value change, They invokes on every change detection cycle resulting the bad performance of the application
It is recommended by the Angular Dev Community to use the pure pipes only
To make the pipes pure or impure, you just have to pass the pure property value of the pipe decorator
If you pass the value as true then that pipe will become the pure pipe similarly, If you pass the value as false then it will become the impure pipe
Note: If you do not pass the value for the pure flag of the pipe decorator then angular considers it as a pure pipe




everything has been covered with simple examples, Please do watch the video till the end to clear understandings


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