Explain the difference between the replace and exclude directives in a go.mod file.
- 'replace' substitutes a module's source
- 'exclude' removes a module
- 'replace' prevents updates
- 'exclude' prevents imports
In a go.mod file, the 'replace' directive is used to substitute a module's source with a local or custom version, allowing you to work on a modified version of a dependency. In contrast, the 'exclude' directive is used to specify that a particular module should not be used as a dependency at all, effectively excluding it from your project. While 'replace' alters the source of a module, 'exclude' prevents the module from being imported altogether.
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