Function: thirteenthMonthCentavos()

thirteenthMonthCentavos(periodBasicCentavos): number

Defined in: src/lib/pay/thirteenthMonth.ts:29

Full-year 13th-month entitlement from the year's per-period basic amounts (centavos).

Sums every pay period's basic pay for the calendar year and returns one twelfth of that total, per Presidential Decree 851. Inputs are sanitized before summing: each amount is truncated toward zero (Math.trunc, dropping any fractional centavo) and floored at zero, so negative or fractional entries cannot reduce or inflate the entitlement. (NaN and +Infinity entries are NOT sanitized and propagate to the result, yielding NaN or Infinity respectively; -Infinity, like any negative value, is floored to 0 by Math.max and contributes nothing.) The final divide-by-12 is rounded to the nearest whole centavo (Math.round). Pure; no I/O or side effects.

Parameters

periodBasicCentavos

readonly number[]

Each pay period's basic pay for the year, in integer centavos (base pay only — excludes allowances, bonuses, the 13th-month itself, and deductions). An empty array yields 0.

Returns

number

The full-year 13th-month entitlement in integer centavos (>= 0 for finite inputs).