lib: add Array::* for repetitions

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/collection/array.nit b/lib/standard/collection/array.nit
index de06850..7d710bd 100644 (file)
--- a/lib/standard/collection/array.nit
+++ b/lib/standard/collection/array.nit
@@ -394,6 +394,26 @@ class Array[E]
                res.append(other)
                return res
        end
+
+       # Repetition of arrays.
+       #
+       # returns a new array built by concatenating `self` `repeat` times.
+       #
+       #    var a = [1,2,3]
+       #    assert (a * 0).is_empty
+       #    assert a * 1  ==  [1,2,3]
+       #    assert a * 2  ==  [1,2,3,1,2,3]
+       #    assert (a * 10).length  ==  30
+       fun *(repeat: Int): Array[E]
+       do
+               assert repeat >= 0
+               var res = new Array[E].with_capacity(length * repeat)
+               while repeat > 0 do
+                       res.add_all(self)
+                       repeat -= 1
+               end
+               return res
+       end
 end
 
 # An `Iterator` on `AbstractArray`