Typescript's union types are really nice for writing interpreters.
type Value = NumberValue | StringValue;
function add(array<Value> args): NumberValue { ... }
I often find that primitive functions get little checking (e.g. just returning a Value) in the host language.
miniblog.
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I keep finding forms that show red errors when I write 'wilfred@' for an email or '0' for a telephone number because I haven't finished inputting the value.
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Excellent series on Self, both the programming model and the tool chain.
I love how opening an inspector on a value (e.g. nil) then shows a link to all occurrences of the value in other open inspectors!
