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What Is Angular Pure Pipe?

What Is Pure Pipe?
Angular executes a pure pipe only when it detects a pure change to the input value. A pure change can be primitive or non-primitive.

Primitive data are only single values, they have not special capabilities and the non-primitive data types are used to store the group of values.

@Pipe({
  name: 'currency'
})

OR
@Pipe({
  name: 'currency',
  pure: true
})

And another example for a pure pipe –
import { PipePipeTransform } from '@angular/core';

@Pipe({
  name: 'currency'
})
export class CurrencyPipe implements PipeTransform {

  transform(valueanyargs?: any): any {
    if (!value) {
      return '1.00';
    }

    return value;
  }
}

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