On-Demand Calculation
On-demand calculation is a computing paradigm where calculations or data processing are performed only when explicitly requested, rather than pre-computed or cached in advance. It optimizes resource usage by avoiding unnecessary computations, often used in systems with dynamic or unpredictable data access patterns. This approach is common in lazy evaluation strategies, real-time analytics, and serverless computing environments.
Developers should use on-demand calculation when building systems where data changes frequently or computations are expensive, such as in real-time dashboards, financial modeling, or interactive applications. It reduces memory and processing overhead by deferring work until needed, improving scalability and cost-efficiency in cloud-based or distributed systems. This is particularly useful in scenarios with sparse data access or when pre-computation is impractical due to variability.