31 lines
866 B
Markdown
31 lines
866 B
Markdown
# Hyperstatic Global Environment
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This now brings up an interesting subpoint. Retro provides a *hyper-
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static global environment.* This can be difficult to explain, so let's
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take a quick look at how it works:
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~~~
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#1000 'a var<n>
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:scale (x-y) @a * ;
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#3 scale putn
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>>> 3000
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#100 !a
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#3 scale putn
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>>> 300
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#5 'a var<n>
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#3 scale putn
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>>> 300
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@a putn
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>>> 5
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~~~
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Output is marked with **\>\>\>**.
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Note that we create two variables with the same name (*a*). The definition
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for `scale` still refers to the old variable, even though we can no longer
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directly manipulate it.
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In a hyper-static global environment, functions continue to refer to the
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variables and earlier functions that existed when they were defined. If
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you create a new variable or function with the same name as an existing
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one, it only affects future code.
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