Is the array sorted?

See also std.algorithm.comparison.

(1) Is the array sorted?

import std.stdio;
import std.algorithm; // equal()

bool is_sorted(const int[] li)
{
return equal(li, li.dup.sort);
}

void main()
{
auto li = [1, 3, 5, 5, 8];

writeln("Sorted: ", is_sorted(li)); // true

writeln("Sorted: ", is_sorted([1, 3, 2])); // false
}

equal() compares two or more ranges for equality, element by element.

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