Mathematical operations in ScriptCode

Mathematical operations in ScriptCode

It is recommended that all mathematical operations in scriptCode be performed through the BigDecimal.

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API

big-decimal.interface.ts

BigDecimal

interface BigDecimal {
  valueOf(value: string | number | BigDecimal): BigDecimal
  add(augend: string | number | BigDecimal): BigDecimal
  subtract(subtrahend: string | number | BigDecimal): BigDecimal
  multiply(multiplicand: string | number | BigDecimal): BigDecimal
  divide(divisor: string | number | BigDecimal): BigDecimal
  divide(divisor: string | number | BigDecimal, roundingMode: string): BigDecimal
  divide(divisor: string | number | BigDecimal, scale: number): BigDecimal
  divide(divisor: string | number | BigDecimal, scale: number, roundingMode: string): BigDecimal
  setScale(newScale: number): BigDecimal
  setScale(newScale: number, roudingMode: string): BigDecimal
  equals(equated: string | number | BigDecimal): boolean
  compareTo(compared: string | number | BigDecimal): int 
}

decimal-format.interface.ts

interface DecimalFormat {
  of(pattern: string): DecimalFormat
  of(pattern: string, symbols: DecimalFormatSymbols): DecimalFormat
  format(value: BigDecimal): string
  parse(value: string): BigDecimal
}

rounding-mode.interface.ts

enum RoundingMode {
  UP,
  DOWN,
  CEILING,
  FLOOR,
  HALF_UP,
  HALF_DOWN,
  HALF_EVEN
}

decimal-format-symbols.interface.ts

enum DecimalFormatSymbols {
  PL,
  EN,
  ES,
  SK,
  CZ
}

random.interface.ts

interface Random {
  uuid(): string
}

BigDecimal

Creating an object

var value = BigDecimal.valueOf("10.1000"); // Recommended

Object BigDecimal is immutable. Operations such as add() do not change the value, they require assigning the result to a variable.

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Mathematical operations

Addition

let value = BigDecimal.valueOf("1");
value = value.add("5"); // 1 + 5 = 6

Subtraction

let value = BigDecimal.valueOf("100");
value = value.subtract("5"); // 100 - 5 = 95

Division

let value = BigDecimal.valueOf("100");
value = value.divide("10"); // 100 / 10 = 10
value = value.divide("3", 5, RoundingMode.UP); // 10 / 3 = 3.33334

Multiplication

let value = BigDecimal.valueOf("1");
value = value.multiply("20"); // 1 * 20 = 20

Setting the scale

value = BigDecimal.valueOf("10.1000");
value = value.setScale(2); // = 10.10
value = value.setScale(1, RoundingMode.HALF_UP); // = 10.1

Comparison and equality

value.equals("10"); // false
value.compareTo("5"); // 1

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DecimalFormat

Class for formatting decimal numbers in different languages. Documentation: DecimalFormat (Java)

Example

let decimalFormatPL = DecimalFormat.of("#.#", DecimalFormatSymbols.PL);
decimalFormatPL.format(BigDecimal.valueOf("34.567")); // 34,6

Patterns

Symbol	Meaning
0	Digit placeholder
#	Digit placeholder (0 omitted)
,	Decimal separator
%	Multiplies by 100 and displays as a percent
E	Scientific notation

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Rounding numbers (RoundingMode)

Mode	Description
HALF_UP	Rounds up if the decimal part ≥ 0.5
CEILING	Always up to the nearest integer
DOWN	Always down
FLOOR	Down to the nearest integer
HALF_DOWN	Down if < 0.5
HALF_EVEN	Banker's rounding (to the even number)

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Preferred result scales

https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/math/BigDecimal.html

Operation	Result scale
Add	max(addend.scale(), augend.scale())
Subtract	max(minuend.scale(), subtrahend.scale())
Multiply	multiplier.scale() + multiplicand.scale()
Divide	dividend.scale() - divisor.scale()
Square root	radicand.scale()/2

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Random

Generating UUIDs (version 4):

function callService(context) {
  return [{ 'output': Random.uuid() }];
}