Is the array sorted?

See also std.algorithm.sorting.

(1) Is sorted?

import std.stdio;
import std.algorithm;

void main()
{
auto a = [1, 2, 3];
auto b = [1, 3, 3, 5, 5, 8];

writeln(isSorted(a)); // true
writeln(isSorted(b)); // true

writeln(isStrictlyMonotonic(a)); // true
writeln(isStrictlyMonotonic(b)); // false
}

Notes:

isSorted(): equal values are allowed
isStrictlyMonotonic(): equal values are NOT allowed

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