Where is the `append()` Function Implemented in Go?

Locating Append() Implementation

In Go, the append() function is a built-in function commonly used to add elements to a slice. While it's widely used, you may face difficulties locating its implementation.

Searching for the Code

Despite attempts to find the implementation code through godoc and IDE jump-to-definition features, you have not had success. Don't worry, you're not alone in this quest.

Actual Implementation

To find the actual implementation of append(), follow this path:

1. GitHub repository for the Go language: https://github.com/golang/go
2. Navigate to the "/src" folder.
3. Go into the "cmd/compile/internal/gc/ssa.go" file.
4. Within this file, locate the function "genAppendDiv" and "genAppendBool" (for slices of bool).

Additional Details

• The implementation of append() is highly optimized for performance.
• It utilizes the growslice function (found in "/src/runtime/slice.go") to efficiently increase slice capacity when necessary.

Conclusion

By following the steps outlined above, you can now access the implementation code for the append() function in Go. This understanding of its internals will enhance your appreciation for its efficiency and power.

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