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docs: clarify the description of pipes (#37950) 

This commit clarifies some of the language regarding pipes in the pipes guide.
This commit also specifies the term transforming rather than formatting.

PR Close #37950
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Changyu Geng 2020-07-07 09:15:44 +08:00 committed by Misko Hevery
parent 8e5969bb52
commit f74cfadf64
1 changed files with 3 additions and 3 deletions
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aio/content/guide/pipes.md
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# Transforming Data Using Pipes
Use [pipes](guide/glossary#pipe "Definition of a pipe") to transform and format strings, currency amounts, dates, and other display data.
Pipes are simple functions you can use in [template expressions](/guide/glossary#template-expression "Definition of template expression") to accept an input value and return a transformed value.
Use [pipes](guide/glossary#pipe "Definition of a pipe") to transform strings, currency amounts, dates, and other data for display.
Pipes are simple functions you can use in [template expressions](/guide/glossary#template-expression "Definition of template expression") to accept an input value and return a transformed value. Pipes are useful because you can use them throughout your application, while only declaring each pipe once.
For example, you would use a pipe to show a date as **April 15, 1988** rather than the raw string format.
<div class="alert is-helpful">
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{@a parameterizing-a-pipe}
## Formatting data with parameters and chained pipes
## Transforming data with parameters and chained pipes
Use optional parameters to fine-tune a pipe's output.
For example, you can use the [`CurrencyPipe`](api/common/CurrencyPipe "API reference") with a country code such as EUR as a parameter.