cyclomatic-complexity.md

Pattern: High cyclomatic complexity

Issue: -

Description

Enforces a threshold of cyclomatic complexity.

Cyclomatic complexity is assessed for each function of any type. A starting value of 0 is assigned and this value is then incremented for every statement which can branch the control flow within the function. The following statements and expressions contribute to cyclomatic complexity:

• catch
• if and ? :
• || and && due to short-circuit evaluation
• for, for in and for of loops
• while and do while loops
• case clauses that contain statements

Rationale: Cyclomatic complexity is a code metric which indicates the level of complexity in a function. High cyclomatic complexity indicates confusing code which may be prone to errors or difficult to modify.

Further Reading

• TSLint - cyclomatic-complexity