What is the difference between static and dynamic analysis?

Question

Accepted Answer

**Static** — analyze without execution. **Dynamic** — analyze during execution.

**Static Analysis:**
- Analyze source code.
- No execution needed.
- Find syntax, style issues.
- Fast, automated.

```
Static:
ESLint: linting rules
SonarQube: code smells
TypeScript: type checking
(No execution)
```

**Dynamic Analysis:**
- Analyze running code.
- Execution needed.
- Find runtime issues.
- Slower, real behavior.

```
Dynamic:
Jest: unit tests
Selenium: browser tests
k6: load tests
(During execution)
```

**Key differences:**
- **Static** — no execution.
- **Dynamic** — execution.
- **Static** — code structure.
- **Dynamic** — runtime behavior.

Systems Analyst: What is the difference between static and dynamic analysis?