feat: add String.fromByte primitive with validation and unit tests

Implement a new String.fromByte(_) static method that creates a single-byte string from an integer 0-255. Includes runtime validation for non-integer, non-numeric, negative, and out-of-range values. Adds the underlying wrenStringFromByte helper in wren_value.c and exposes it via a new DEF_PRIMITIVE in wren_core.c. Documents the method in the core string markdown and provides six test cases covering happy path and all error conditions.
2019-02-27 13:05:07 +00:00
parent 92e5fc7cf5
commit 2049f1bfb1
9 changed files with 44 additions and 0 deletions
@@ -57,6 +57,15 @@ Creates a new string containing the UTF-8 encoding of `codePoint`.
 It is a runtime error if `codePoint` is not an integer between `0` and
 `0x10ffff`, inclusive.

+### String.**fromByte**(byte)
+
+Creates a new string containing the single byte `byte`.
+
+    :::wren
+    String.fromByte(255) //> �
+
+It is a runtime error if `byte` is not an integer between `0` and `0xff`, inclusive.
+
 ## Methods

 ### **bytes**