Variable declaration reset: Difference between revisions
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=={{header|Julia}}==
In Julia, variables are declared by being defined. Because variables also must be initialized before they are
referred to in compiled code, the code below yields an error that the variable `prev` is not defined:
<lang julia>
s = [1, 2, 2, 3, 4, 4, 5]
for i in eachindex(s)
curr = s[i]
i > 1 && curr == prev && println(i)
prev = curr
end
</lang>
If the variable `prev` is defined before the `for` statement, the code then runs. We also may
declare the variable `prev` as global to refer explicitly to the variable declared outside of the for block:
<lang julia>
s = [1, 2, 2, 3, 4, 4, 5]
prev = -1
for i in eachindex(s)
global prev
curr = s[i]
i > 1 && curr == prev && println(i)
prev = curr
end
</lang> {{out}}
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