---
source: crates/biome_js_analyze/tests/spec_tests.rs
expression: lambdas.js
---
# Input
```jsx
function lambdas(array) {
    for (item of array) {              // +1, nesting = 1
        if (item) {                    // +2, nesting = 2
            const a = () => {          // nesting = 3
                if (item > 10) {       // +4, nesting = 4
                    return item;
                }
            };

            function b() {             // nesting = 3
                if (item > 10) {       // +4, nesting = 4
                    return item;
                }
            }

            const c = function() {     // nesting = 3
                if (item > 10) {       // +4, nesting = 4
                    return item;
                }
            };

            const d = function d() {   // nesting = 3
                if (item > 10) {       // +4, nesting = 4
                    return item;
                }
            };
        }
    }
}

```

# Diagnostics
```
lambdas.js:4:26 lint/complexity/noExcessiveCognitiveComplexity ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Excessive complexity detected.
  
    2 │     for (item of array) {              // +1, nesting = 1
    3 │         if (item) {                    // +2, nesting = 2
  > 4 │             const a = () => {          // nesting = 3
      │                          ^^^
    5 │                 if (item > 10) {       // +4, nesting = 4
    6 │                     return item;
  
  i Please refactor this function to reduce its complexity score from 4 to the max allowed complexity 3.
  

```

```
lambdas.js:10:22 lint/complexity/noExcessiveCognitiveComplexity ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Excessive complexity detected.
  
     8 │             };
     9 │ 
  > 10 │             function b() {             // nesting = 3
       │                      ^
    11 │                 if (item > 10) {       // +4, nesting = 4
    12 │                     return item;
  
  i Please refactor this function to reduce its complexity score from 4 to the max allowed complexity 3.
  

```

```
lambdas.js:16:23 lint/complexity/noExcessiveCognitiveComplexity ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Excessive complexity detected.
  
    14 │             }
    15 │ 
  > 16 │             const c = function() {     // nesting = 3
       │                       ^^^^^^^^
    17 │                 if (item > 10) {       // +4, nesting = 4
    18 │                     return item;
  
  i Please refactor this function to reduce its complexity score from 4 to the max allowed complexity 3.
  

```

```
lambdas.js:22:32 lint/complexity/noExcessiveCognitiveComplexity ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ! Excessive complexity detected.
  
    20 │             };
    21 │ 
  > 22 │             const d = function d() {   // nesting = 3
       │                                ^
    23 │                 if (item > 10) {       // +4, nesting = 4
    24 │                     return item;
  
  i Please refactor this function to reduce its complexity score from 4 to the max allowed complexity 3.
  

```