Lazy Evaluation

Kind: approach

Layer: Execution Core

Record: architecture:lazy-evaluation

Severity: contextual

Scope: computation, collection, stream

Canonical: Ontology

An approach in which a value is computed only when something consumes it.

Listed in Architecture principles, after Pipeline Architecture and before Sequential Access.

Requires

• Deferred Execution Semantics

Reinforces

• Memory Efficiency

Enables

• Avoiding Unneeded Work

In tension with

• Debuggability/Resource Lifetime
• Eager Full Materialization

Tensions

• Lazy Evaluation / Debuggability/Resource Lifetime
• Lazy Evaluation / Eager Full Materialization

Violated by

• Full Materialization

Refactored by

• Iterator Pattern

Severity

• contextual

Category

• Streaming / Pipeline / Dataflow Processing

Linked from

• The direction axis
• Scalability / Performance / Optimization
• Scalability / Performance / Optimization
• Streaming / Pipeline / Dataflow Processing
• Severity levels
• The resolutions

in this codebase

• registerPage
• presentation/records
• presentation/records/records.barrel.ts