amount-ts

TypeScript Amount Formatting

Summary

amount-ts is a formatting library with a dead-simple interface. It has three methods: to, from and toJson.

Based on wNumb.js library (author Leon Gersen).

Check this library in BUNDLEPHOBIA

Repository

Installation

Execute the following command in the terminal, being located in the main route of your project.

npm install --save amount-ts

Usage

Simple

const formatter: Amount = new Amount({
    mark: '.',
    thousand: ',',
    prefix: '$ ',
    suffix: ' p.p.',
});

// Format a number:
const result: string = formatter.to(301980.62);
console.log(result); // => '$ 301,980.62 p.p.'

// Get a number back:
const inverse: number = formatter.from('$ 301,980.62 p.p.');
console.log(inverse); // => 301980.62

Appending money-formatting

// Appending money-formatting
const formatter: Amount = new Amount({
    prefix: '$ ',
    decimals: 3,
    thousand: ',',
});

// Numbers are always correctly rounded
const result: string = formatter.to(980735.2635);
console.log(result); // => '$ 980,735.264'

Manually edit numbers

// Manually edit numbers
const formatter: Amount = new Amount({
    thousand: '.',
    encoder: function( a ){
        return a * 1E7;
    },
    decoder: function( a ){
        return a / 1E7;
    },
});

// Numbers are always correctly rounded
const result: number = formatter.from('-95.060.000.000');
console.log(result); // => -9506

Prefixing negative numbers with a string

// Prefixing negative numbers with a string
const formatter: Amount = new Amount({
    prefix: '$',
    negativeBefore: '[NEGATIVE] ',
    decimals: 0,
});

// Format a number:
const result: string = formatter.to(-260);
console.log(result); // => '[NEGATIVE] $260'

// Get a number back:
const inverse: number = formatter.from('[NEGATIVE] $260');
console.log(inverse); // => -260

Parsing miss-matches and typo's

// Parsing miss-matches and typo's
const formatter: Amount = new Amount({
    prefix: '$',
    suffix: ',-',
    thousand: ',',
});

// No problem. If there is a sensible number in the entry,
// it'll be extracted, even if pre/post-fixes are missing or off.
const inverse: number = formatter.from('90000 money');
console.log(inverse); // => 90000

// No idea... If the value makes no sense,
// the 'from' method returns false.
console.log(formatter.from('spaaaaacceeee!!!')); // => 0

New features

Custom currencies

// Custom currencies
const currency: CurrencyInterface = {
    code: 'ARS',
    symbol: '$',
    thousandsSeparator: '.',
    decimalSeparator: ',',
    symbolOnLeft: true,
    spaceBetweenAmountAndSymbol: true,
    decimalDigits: 2,
};

const formatter: Amount = Amount.fromCurrency(currency);
const result: string = formatter.to(301980.62);
console.log(result); // => '$ 301.980,62'

// And inverse
const inverse: number = formatter.from('$ 301.980,62');
console.log(inverse); // => 301980.62

Known currencies

See ISO 4217

// Known currencies. See: https://en.wikipedia.org/wiki/ISO_4217
const formatter: Amount = Amount.fromCurrencyString('ARS');
const result: string = formatter.to(301980.62);
console.log(result); // => '$ 301.980,62'

Millions...

// Millions. See: https://en.wikipedia.org/wiki/ISO_4217
const formatter: Amount = Amount.fromCurrencyString('ARS');
const result: string = formatter.to(3019242580.62);
console.log(result); // => '$ 3.019M'

To JSON

// To Json. See: https://en.wikipedia.org/wiki/ISO_4217
const formatter: Amount = Amount.fromCurrencyString('ARS');
const result: FormatsInterface = formatter.toJson(301980.62);
console.log(result);

/*
 // =>
{
    decimals: ',62',
    decimalsWithoutMark: '62',
    withCode: 'ARS 301.980,62',
    withCurrency: '$ 301.980,62',
    withoutCurrency: '301.980,62',
    withoutCurrencyAndDecimals: '301.980',
    withoutDecimals: '$ 301.980',
}
*/

To JSON (complete)

// To Json (complete). See: https://en.wikipedia.org/wiki/ISO_4217
const result: JsonMoneyInterface = Amount.toJSON('ARS', 301980.62);
console.log(result);

/*
 // =>
{
    currency: {
        code: 'ARS',
        decimalDigits: 2,
        decimalSeparator: ',',
        spaceBetweenAmountAndSymbol: true,
        symbol: '$',
        symbolOnLeft: true,
        thousandsSeparator: '.',
    },
    format: {
        decimals: ',62',
        decimalsWithoutMark: '62',
        withCode: 'ARS 301.980,62',
        withCurrency: '$ 301.980,62',
        withoutCurrency: '301.980,62',
        withoutCurrencyAndDecimals: '301.980',
        withoutDecimals: '$ 301.980',
    },
    value: 301980.62,
}
*/

Author

Matias Nahuel Améndola

Linkedin

GitHub

Mail

Any suggestion is welcome

Licence

Licensed MIT, so free for personal and commercial use.