Evaluate/Execute Golang code/expressions like js' eval()

Question

Is there a eval() like method on golang?

Evaluate/Execute JavaScript code/expressions:

var x = 10;
var y = 20;
var a = eval("x * y") + "<br>";
var b = eval("2 + 2") + "<br>";
var c = eval("x + 17") + "<br>";

var res = a + b + c;

The result of res will be:

200
4
27

Is this possible in golang? and why?

Answer 1

Its perfectly possible. At least for expressions, which seems to be what you want:

Have a look at:

• https://golang.org/src/go/types/eval.go

• https://golang.org/src/go/constant/value.go

• https://golang.org/pkg/go/types/#Scope

You'd need to create your own Package and Scope objects and Insert constants to the package's scope. Constants are created using types.NewConst by providing appropriate type information.