---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: nestedControlFlowStructures.js
---
# Input
```jsx
function nestedControlFlowStructures(num) {
    try {
        if (condition1) {                        // +1
            for (let i = 0; i < 10; i++) {       // +2 (nesting=1)
                while (condition2) { /* ... */}  // +3 (nesting=2)
            }
        }
    } catch (error) {                            // +1
        if (condition2) { /* ... */}             // +2 (nesting=1)
    }
}

```

# Diagnostics
```
nestedControlFlowStructures.js:1:10 lint/complexity/noExcessiveCognitiveComplexity ━━━━━━━━━━━━━━━━━

  ! Excessive complexity detected.
  
  > 1 │ function nestedControlFlowStructures(num) {
      │          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │     try {
    3 │         if (condition1) {                        // +1
  
  i Please refactor this function to reduce its complexity score from 9 to the max allowed complexity 8.
  

```