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From the docs, local variables are defined as:

  • script-variable s: Local to a :source'ed Vim script.
  • function-argument a: Function argument (only inside a function).
  • local-variable l: Local to a function.

It seems that a is the simplest and most narrow -- this can never be user-defined within a function and is only used to reference the variables that were passed to a given function. In other words, I cannot do something like a:name = "Tom", and its the only variable type that cannot be defined on the left-hand side.

What would be the difference then between l and s? As far as I understand, l:var can only be done inside a function and is illegal to use outside of a function, and once the function is done the l:var variable is discarded. And then s:var I'm not too clear on at all (for example, why can't I call this from the command-line within the function its being used?).

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    As @Matt said here: script local variables are as static variables in C. In vimscript language, ther name is quite explicit: their scope is restricted to the script they belong to. They cannot be referenced outside. And as usual with programming with every other programming language that I know, local variables cannot be used outside the scope of their function. Jun 13, 2020 at 23:00
  • @LucHermitte -- I see, the only other thing I thought odd was when I define a variable in, for example, .vimrc it adds that variable into g: rather than s:. Why does a variable defined outside a function in a script belong to the g: scoope?
    – David542
    Jun 13, 2020 at 23:14
  • It's like how it works in C. Variables defined at file (translation unit actually) level that aren't explicitly declared static are global variables. Vim follows the same rule. Jun 13, 2020 at 23:30

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