Angular has the ability to round numbers to the nearest integer using a pipe

Question

Angular has the ability to round numbers to the nearest integer using a pipe

How do we round a number to the nearest dollar or integer? For example, rounding 2729999.61 would result in 2730000.

Is there a method in Angular template that can achieve this using the number pipe? Such as using | number or

| number : '1.2-2'

javascript angular typescript

Answer 1

Answer №1

According to the DecimalPipe documentation:

The digitsInfo parameter determines how the decimal representation is displayed in the format:
{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}

It's important to note:

If the formatted value is truncated, it will be rounded using the "to-nearest" method.

For example, use number: '1.0-0':

// Example in your component:
myNumber = 2729999.61;

// Template usage:
<p>Rounded number: {{ myNumber | number: '1.0-0' }}</p>
// Output will be 'Rounded number: 2,730,000'

If you need to customize number formatting further, creating a custom pipe is simple. Here's an example that uses Math.round:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'customNumber' })
export class CustomNumberPipe implements PipeTransform {
  transform(value: number, ...args: any[]) {
    return Math.round(value);
  }
}

To use the custom pipe, ensure it's imported as a declaration in your app module, then:

<!-- Output will be 'Rounded with custom pipe: 2730000' -->
<p>Rounded with custom pipe: {{ myNumber | customNumber }}</p>

Here's a live demo on stackblitz with both options to help you get started.

Answer 2

According to the DecimalPipe documentation:

The digitsInfo parameter determines how the decimal representation is displayed in the format:
{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}

It's important to note:

If the formatted value is truncated, it will be rounded using the "to-nearest" method.

For example, use number: '1.0-0':

// Example in your component:
myNumber = 2729999.61;

// Template usage:
<p>Rounded number: {{ myNumber | number: '1.0-0' }}</p>
// Output will be 'Rounded number: 2,730,000'

If you need to customize number formatting further, creating a custom pipe is simple. Here's an example that uses Math.round:

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'customNumber' })
export class CustomNumberPipe implements PipeTransform {
  transform(value: number, ...args: any[]) {
    return Math.round(value);
  }
}

To use the custom pipe, ensure it's imported as a declaration in your app module, then:

<!-- Output will be 'Rounded with custom pipe: 2730000' -->
<p>Rounded with custom pipe: {{ myNumber | customNumber }}</p>

Here's a live demo on stackblitz with both options to help you get started.

Angular has the ability to round numbers to the nearest integer using a pipe

Answer №1

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