Nested function: Difference between revisions
Content deleted Content added
Examples for nested functions |
Lua |
||
Line 21: | Line 21: | ||
} |
} |
||
Console.WriteLine(MakeList(". ")); |
|||
</lang> |
</lang> |
||
Line 36: | Line 36: | ||
return makeItem("first") + makeItem("second") + makeItem("third"); |
return makeItem("first") + makeItem("second") + makeItem("third"); |
||
} |
} |
||
console.log(makeList(". ")); |
|||
</lang> |
|||
=={{header|Lua}}== |
|||
<lang lua> |
|||
function makeList(separator) |
|||
local counter = 1 |
|||
local function makeItem(item) |
|||
return counter .. separator .. item .. "\n" |
|||
end |
|||
return makeItem("first") .. makeItem("second") .. makeItem("third") |
|||
end |
|||
print(makeList(". ")) |
|||
</lang> |
</lang> |
||
Revision as of 10:48, 17 September 2016
In many languages, functions can be nested, so there are outer functions and inner functions. The inner function can then access the variables of the outer function. In most languages, the inner function can also modify variables from the outer function.
The following examples for MakeList or makeList generate the following text:
1. first 2. second 3. third
C#
<lang csharp> string MakeList(string separator) {
var counter = 1;
var makeItem = new Func<string, string>((item) => { return counter++ + separator + item + "\n"; });
return makeItem("first") + makeItem("second") + makeItem("third");
}
Console.WriteLine(MakeList(". ")); </lang>
JavaScript
<lang javascript> function makeList(separator) {
var counter = 1;
function makeItem(item) { return counter++ + separator + item + "\n"; }
return makeItem("first") + makeItem("second") + makeItem("third");
}
console.log(makeList(". ")); </lang>
Lua
<lang lua> function makeList(separator)
local counter = 1
local function makeItem(item) return counter .. separator .. item .. "\n" end
return makeItem("first") .. makeItem("second") .. makeItem("third")
end
print(makeList(". ")) </lang>
References
- Wikipedia article on nested functions