Merge pull request #259 from moonbitlang/hongbo/string-to-array

String to array #256

.gitattributes

@@ -0,0 +1 @@
+

string/moon.pkg.json

@@ -3,6 +3,7 @@
         "moonbitlang/core/builtin",
         "moonbitlang/core/assertion",
         "moonbitlang/core/coverage",
-        "moonbitlang/core/bytes"
+        "moonbitlang/core/bytes",
+        "moonbitlang/core/char"
     ]
 }

string/string.mbt

@@ -91,3 +91,23 @@ test "Buffer::to_bytes" {
   buffer.write_string("中文")
   @assertion.assert_eq(buffer.to_bytes().to_string(), "中文")?
 }
+
+/// Converts the String into an array of Chars.
+pub fn to_array(self : String) -> Array[Char] {
+  let len = self.length()
+  let rv = Array::make(len, '\x00')
+  for i = 0; i < len; i = i + 1 {
+    rv[i] = self[i]
+  }
+  rv
+}
+
+test "to_array" {
+  let a = "你好！mbt".to_array()
+  inspect(a[0], ~content="你")?
+  inspect(a[1], ~content="好")?
+  inspect(a[2], ~content="！")?
+  inspect(a[3], ~content="m")?
+  inspect(a[4], ~content="b")?
+  inspect(a[5], ~content="t")?
+}