Problems › TypeScript › machines
How many machines are past calibration
Every machine has a last calibration date and a calibration interval in days. Count how many should have been recalibrated by today.
- A machine is overdue when today minus its last service is strictly greater than its interval.
- An interval of zero or less is a broken policy and counts as always overdue.
calibrationOverdue(machines: list<Machine>, today: int) → int
Where you start
function calibrationOverdue(machines: Machine[], today: number): number {
}Worked examples
| Call | Result |
|---|---|
calibrationOverdue([{"lastService":100,"intervalDays":10},{"lastService":95,"intervalDays":10},{"lastService":110,"intervalDays":10}], 110) | 1 |
calibrationOverdue([{"lastService":0,"intervalDays":0}], 100) | 1 |
calibrationOverdue([{"lastService":100,"intervalDays":20},{"lastService":100,"intervalDays":20}], 119) | 0 |
calibrationOverdue([], 50) | 0 |
Hint
Run the strict comparison, with the broken-policy case short-circuiting.
Reference solution in TypeScript
function calibrationOverdue(machines: Machine[], today: number): number {
let n = 0;
for (const m of machines) {
if (m.intervalDays <= 0 || today - m.lastService > m.intervalDays) n++;
}
return n;
}