[bug]: VM emulator doesn't allow empty strings.

[dorianignee]

Tool

VM Emulator

Interface

Website (https://nand2tetris.github.io/web-ide)

Contact Details

[email protected]

What happened?

The VM emulator throws ERR14 when working with an empty string.

Reproduction steps:

1. paste the following code into a Main.jack file in the jack compiler:

class Main {
    function void main() {
        var String empty;
        let empty = "";
        return;
    }
}

2. Click "Compile", then click "Run"
3. When the VM emulator opened up, press the [>>] button to start the simulation

Workaround:
Since strings start empty and only contain characters, when they are appended using the String.appendChar(c) function, you can create an empty string with let empty = String.new(1);.

Additional Comments

No response

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