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fix: support negative precision in Truncate #419

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fix: support negative precision in Truncate #419

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7 changes: 5 additions & 2 deletions decimal.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1753,13 +1753,16 @@ func (d Decimal) Ceil() Decimal {

// Truncate truncates off digits from the number, without rounding.
//
// NOTE: precision is the last digit that will not be truncated (must be >= 0).
// NOTE: precision is the last digit that will not be truncated.
// Positive values truncate decimal places; negative values truncate
// integer digits (e.g., -2 rounds to nearest hundred).
//
// Example:
//
// decimal.NewFromString("123.456").Truncate(2).String() // "123.45"
// decimal.NewFromString("5432").Truncate(-2).String() // "5400"
func (d Decimal) Truncate(precision int32) Decimal {
if precision >= 0 && -precision > d.exp {
if -precision > d.exp {
return d.rescale(-precision)
}
return d
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