tubería de número angular
//{{ value_expression | number [ : digitsInfo [ : locale ] ] }}
//Assume someNumber = 12.221
<!--output '12'-->
<p>{{ someNumber | number : '1.0-0'}}</p>
//The output here is '12' because we cut the decimals off
//with the number pipe
//More examples from Angular:
//Assume:
//pi: number = 3.14;
//e: number = 2.718281828459045;
<!--output '2.718'-->
<p>e (no formatting): {{e | number}}</p>
<!--output '002.71828'-->
<p>e (3.1-5): {{e | number:'3.1-5'}}</p>
<!--output '0,002.71828'-->
<p>e (4.5-5): {{e | number:'4.5-5'}}</p>
<!--output '0 002,71828'-->
<p>e (french): {{e | number:'4.5-5':'fr'}}</p>
<!--output '3.14'-->
<p>pi (no formatting): {{pi | number}}</p>
<!--output '003.14'-->
<p>pi (3.1-5): {{pi | number:'3.1-5'}}</p>
<!--output '003.14000'-->
<p>pi (3.5-5): {{pi | number:'3.5-5'}}</p>
<!--output '-3' / unlike '-2' by Math.round()-->
<p>-2.5 (1.0-0): {{-2.5 | number:'1.0-0'}}</p>
//More information here: https://angular.io/api/common/DecimalPipe
ChernobylBob