Writing A Compiler In Go by Thorsten Ball

Author:Thorsten Ball [Ball, Thorsten]
Language: eng
Format: epub, pdf
Published: 2018-07-28T23:00:00+00:00

In executeBinaryOperation the conditional has been changed into a switch statement with a new case branch for strings. There, we delegate the actual adding of two strings to executeBinaryStringOperation, which unwraps the *object.Strings, concatenates the underlying Go strings and pushes the result back on to the VM’s stack.

And that’s it:

$ go test ./vm ok monkey/vm 0.028s

Monkey strings are now fully implemented, including string concatenation. Next up: arrays.

Array

Arrays are the first composite data type we’re adding to this Monkey implementation. That means, roughly speaking, arrays are composed out of other data types. The practical consequence for us is that we can’t treat array literals as constant expressions.

Since an array is made up of multiple elements and an array literal consists of multiple expressions that produce these elements, the value of the array literal itself might change between compile and run time. Here’s an example:

[1 + 2, 3 + 4, 5 + 6]

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