#rounding code explainers

php

<?php
 
namespace App\Services;

Calculating a cart total with a Money type

value-objects money-arithmetic domain-logic

Intermediate 7 steps

php

final class InvoiceCalculator
{
    private const SCALE = 4;

Precise money math with PHP's BCMath

bcmath arbitrary precision money

Intermediate 8 steps

java

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;

Serializing Money to JSON in Spring

serialization jackson money

Intermediate 8 steps

java

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Currency;

A safe Money value type in Java

immutability bigdecimal value-object

Intermediate 10 steps

python

from decimal import Decimal, ROUND_HALF_UP
 
from babel.numbers import format_currency
from flask import Flask

Building a currency Jinja filter in Flask

template filters decimal precision internationalization

Intermediate 6 steps

ruby

require "bigdecimal"
 
module Money
  CENTS = BigDecimal("0.01")

Handling money safely with BigDecimal in Ruby

bigdecimal rounding currency

Intermediate 7 steps

java

package com.example.billing;
 
import java.math.BigDecimal;
import java.math.RoundingMode;

Locale-aware currency formatting in Java

internationalization rounding immutability

Intermediate 6 steps