⚡ add to_num & to_char in std.string

std/lib.nas

@@ -1,7 +1,6 @@
 # lib.nas
 # 2019 ValKmjolnir
 use std.math;
-use std.string;
 use std.io;
 use std.os;
 use std.unix;

std/string.nas

@@ -9,4 +9,33 @@ var join = func(sep, vec) {
         res ~= (i==len-1? "":sep);
     }
     return res;
-}
+}
+
+var __temp_char = func(number) {
+    return __char(number);
+}
+
+var __temp_append = func(vec, elem...) {
+    return __append(vec, elem);
+}
+
+var __temp_contains = func(hash, key) {
+    return __contains(hash, key);
+}
+
+var __num_to_char = [];
+var __char_to_num = {};
+func() {
+    for(var i = 0; i<256; i += 1) {
+        __temp_append(__num_to_char, __temp_char(i));
+        __char_to_num[__temp_char(i)] = i;
+    }
+}();
+
+var to_char = func(number) {
+    return 0<=number and number<256? __num_to_char[number]:"";
+}
+
+var to_num = func(character) {
+    return __temp_contains(__char_to_num, character)? __char_to_num[character]:-1;
+}