Built-in Pipes in Angular 2

Pipes in Angular give you an easy way to transform data directly in your templates. You can create your own custom pipes, and you can also use any of the following ones, which are part of the CommonModule and available right out of the box:

Async

The Async pipe automatically subscribes to an Observable or a Promise and returns the emitted values as they come in:

<ul>
  <li *ngFor="let item of data | async">
    {{ item.name }}
  </li>
</ul>

Currency

The Currency pipe allows to format numbers in different currencies:

{{ price | currency:'CAD' }}
{{ price | currency:'USD':true }}
{{ price | currency:'EUR':false:3.2-2 }}
  • The first argument is a string with the local currency code.
  • The second possible argument is a boolean to show the that will show either the currency symbol, or the currency code. The default is false and shows the currency code.
  • The third possible is a string in the format of the decimal pipe to format the number.

Date

Format date values with the Date pipe:

{{ someDate | date:'medium' }}
{{ someDate | date:'fullDate' }}
{{ someDate | date:'yy' }}
{{ someDate | date:'Hm' }}

You can use a number of symbols to define a custom format, or you can also use a number of predefined keywords. The available keywords are the following: ‘medium’, ‘short’, ‘fullDate’, ‘longDate’, ‘mediumDate’, ‘shortDate’, ‘mediumTime’ and ‘shortTime’.

See the official API reference for a list of symbols.

Decimal

The Decimal pipe formats decimal values:

{{ decimalValue | number:'4.3-5' }}

In the above example (‘4.3-5’), 4 is for the minimum number of integer digits, 3 is for the minimum number of fraction digits and 5 is for the maximum number of fraction digits.

Json

The Json pipe is useful for debugging and displays an object as a Json string. It uses JSON.stringify behind the scenes:

{{ someObject | json }}

LowerCase & UpperCase

Covert text to either lower case or upper case with the respective pipe:

{{ user.name | uppercase }}
{{ user.name | lowercase }}

Percent

The Percent pipe transforms a number into it’s percentage value:

{{ decimalValue | percent }}
{{ decimalValue | percent:'3.2-3' }}

The optional argument is a string in the Decimal pipe format.

Slice

Create a subset list or string with the Slice pipe:

{{ someText | slice:3:6 }}
<ul>
  <li *ngFor="let item of someList | slice:2">
    {{ item }}
  </li>
</ul>

The arguments are the start index and the end index. The end index can be omitted, and the resulting list or string will contain everything from the start index to the end.

👉 There are also 2 more built-in pipes that are currently at the experimental stage: I18nPlural and I18nSelect.

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