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1

"do...end" statement [closed]

Asked by
User#11893 186
11 years ago

I was examining some code, and I saw something that started with "do" and nothing else. It looked like a normal loop or something, but without anything special. What does this do?

Example:

hi = "hello"
do
    local hi = "yo"
    print(hi)
end
print(hi)

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Why was this question closed?

1 answer

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5
Answered by
Unclear 1776 Moderation Voter
11 years ago

What you're referring to is a do-end block. They come in the format below:

do
-- code block
end

So what's the advantage? do-end allows you to delimit a code block whenever you want. This is especially useful because delimiting a code block creates a new scope to place local variables in, should you ever require them.

Here's an example of this...

local a = 1

do
    local a = 3
    print("a = " .. a) -- prints a = 3
end

print("a = " .. a) -- prints a = 1

The scope of the variable a inside of the do-end block in my example is only within the do-end block. If you run the code, you can confirm that the variable's scope doesn't extend past the block.

2
It's very useful for controlled scopes. Quenty 226 — 11y
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