Editing First-class function (section)

=== Anonymous and nested functions ===
{{further information|Anonymous function|Nested function}}
In languages supporting anonymous functions, we can pass such a function as an argument to a higher-order function:
<syntaxhighlight lang="haskell">
main = map (\x -> 3 * x + 1) [1, 2, 3, 4, 5]
</syntaxhighlight>

In a language which does not support anonymous functions, we have to bind it to a name instead:
<syntaxhighlight lang="c">
int f(int x) {
    return 3 * x + 1;
}

int main() {
    int list[] = {1, 2, 3, 4, 5};
    map(f, list, 5);
}
</syntaxhighlight>