I need help using the bigmoney.js plug.

Question

Hello, I need to do calculations like the bigmoney.js plug, someone explain me with examples how to use.. make transactions in our "real" currency, need mainly for percentage, how to calculate percentage and and dpois add this value to the result.

Answer 1

Include the plugin

First you have to start by including the plugin and particularly the file bigmoney-all.js:

<script src="bigmoney-all.js"></script>

If you are working with Node JS you can do so at the expense of require('bigmoney'), as long as you put it in the folder beforehand node_modules.

Configure the conversions

Then you can set up the various currencies available as well as your conversion rates if you wanted to convert between currencies:

Money.settings = {
    base: "BRL",
    rates: {
        BRL : 1, //Esta é a base, as outras são calculadas convertendo a partir desta
        USD: 0.31,
        EUR: 0.25
    },
    format: "%decimal %currency"
}

^{With special attention that the conversions I put forward refer to the day this reply was published.}

Conversions are done by calling the method convert passing the currency to which you wish to convert:

dinheiro.convert('USD'); //obter o resultado da conversão para dólar americano

Create money

Now every time you want to work with the currency just create a new object with Money() and specify the currency:

let dinheiro = Money(325, "BRL");

Available operations

If you want to operate on this money you can use the various arithmetic operators provided by the library:

• plus - add up
• minus - subtract
• times - multiply
• div - divide
• mod - rest of the division

Remembering that each operation returns the new result.

Now let’s look at an example where we calculate and add 10% of R$ 325:

let dinheiro = Money(325, "BRL");
dinheiro = dinheiro.plus(dinheiro.div(10)); //dinheiro soma com dinheiro a dividir por 10
console.log(dinheiro.valueOf()) //357.5

At any time want to know the value that the variable has just use the method valueOf.

Formatting

To show specifying a formatting you have to use the method format:

console.log(dinheiro.format("R$ %decimal")); //mostra R$ 357.5

You can even preset the currency format to simplify later formatting at the expense of formatter:

Money.formatter = function(decimal, currency, formatParam) {
    switch(currency) {
        case 'USD': return "$" + decimal;
        case 'EUR': return "€" + decimal;
        case 'JPY': return "¥" + decimal;
        case 'BRL': return "R$ " + decimal;
        default: return decimal + " " + currency;
    }
};

Now if you have money in real format, just show by calling format parameter-less:

let dinheiro = Money(100, "BRL");
console.log(dinheiro.format()); //mostra R$ 100

If you want you can even use the format available in Number.toLocaleString to simplify and get closer to the usual daily use:

Money.formatter = function(decimal, currency, formatParam) {
    switch(currency) {
        case 'USD': return "$" + decimal;
        case 'EUR': return "€" + decimal;
        case 'JPY': return "¥" + decimal;
        case 'BRL': return decimal.toLocaleString('pt-br',{style: 'currency', currency: 'BRL'});
        default: return decimal + " " + currency;
    }
};

let dinheiro = Money(100, "BRL");
console.log(dinheiro.format()); //mostra R$100,00