Can Go Evaluate Code Like JavaScript's eval()?

Eval and Execute Golang Code Like JS' eval()

In JavaScript, the eval() method enables the evaluation and execution of code or expressions on the fly. This feature provides flexibility in dynamic code execution.

Is there an equivalent function in Go that allows for such dynamic evaluation? The answer is yes, though with some limitations.

Go's eval-like capabilities lie in its Expression Evaluation Library. It provides a set of packages and interfaces for evaluating expressions inputted as strings. However, unlike JavaScript's eval(), Go's expression evaluator is limited to expressions rather than arbitrary code.

To utilize this functionality, you can explore the following resources:

• [go/types/eval](https://golang.org/src/go/types/eval.go)
• [go/constant/value](https://golang.org/src/go/constant/value.go)
• [go/types/#Scope](https://golang.org/pkg/go/types/#Scope)

To evaluate an expression, you must create a Package and Scope object, insert constants into the package's scope, and use types.NewConst to create constants with appropriate type information.

For instance, to calculate x * y in Go, you would create a package, xp, with a variable Constant containing the expression x * y. Anschließend can this constant be evaluated via the Expression Evaluation Library to obtain the result.

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