Merge pull request #1889 from arturo-lang/add-char-support-for-prefix

[Strings] Add Char support for `prefix?`

Author: drkameleon

src/library/Strings.nim

@@ -1109,19 +1109,26 @@ proc defineLibrary*() =
         description = "check if string starts with given prefix",
         args        = {
             "string": {String},
-            "prefix": {String, Regex}
+            "prefix": {String, Regex, Char}
         },
         attrs       = NoAttrs,
         returns     = {Logical},
         example     = """
             prefix? "hello" "he"          ; => true
             prefix? "boom" "he"           ; => false
+            ..........
+            prefix? "hello" {/\w+/}       ; => true
+            prefix? "world" {/\d+/}       ; => false
+            ..........
+            prefix? "hello" 'h'           ; => true
         """:
             #=======================================================
-            if yKind==Regex:
+            if likely(yKind==String):
+                push(newLogical(x.s.startsWith(y.s)))
+            elif yKind==Regex:
                 push(newLogical(x.s.startsWith(y.rx)))
             else:
-                push(newLogical(x.s.startsWith(y.s)))
+                push(newLogical(x.s.len > 0 and x.s.runeAtPos(0)==y.c))
 
     builtin "suffix?",
         alias       = unaliased, 

version/build

@@ -1 +1 @@
-3341
+3342