What are the different types of Pipes in Angular?

There are 2 types of pipes: pure and impure. Pipes are pure by default. You make a pipe impure by setting its pure flag to false.

@Pipe({
  name: 'exponential',
  pure: false
})

Angular executes a pure pipe only when it detects a pure change to the input value. A pure change is either a change to a primitive input value such as String, Number, Boolean, Symbol or a changed object reference like Date, Array, Function or Object.

Angular executes an impure pipe during every component change detection cycle. An impure pipe is called often, even for every keystroke or mouse movement. Implement an impure pipe with great care since an expensive, long-running pipe could affect performance and user experience.

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