Fix the mysteriously failing i

documents/knowledge/elements.yaml

@@ -1185,21 +1185,23 @@
   arity: 2
   overloads:
       any-num: a[b] (index)
+      num-any: b[a] (index)
+      str-str: enclose b in a (b[0:len(b)//2] + a + b[len(b)//2:])
       any-[x]: a[:b] (0 to bth item of a)
       any-[x,y]: a[x:y] (x to yth item of a)
       any-[x,y,m]: a[x:y:m] (x to yth item of a, taking every mth)
   vectorise: false
   tests:
-      - '["abc",1] : "b"'
+      - '["abc",[1,2]] : "b"'
+      - '["joemama","biden''s"] : "joebiden''smama"'
       - "[[1,2,3], 0] : 1"
       - "[[1,2,3], -1] : 3"
       - "[[1,2,3], -0.1] : 1"
       - "[[1,2,3], 1.9] : 2"
       - "[[2,3,4,5], [2]] : [2,3]"
       - "[[1,3,5,7],[1,3]] : [3,5]"
-      - "[1357,[1,3]] : 35"
+      - "[4,[1,3,4]] : 3"
       - "[[1,2,3,4,5,6,7,8,9,10],[1,8,2]] : [2,4,6,8]"
-      - "[12345678910,[1,8,2]] : 2468"
 
 - element: "j"
   name: Join

vyxal/elements.py

@@ -2034,11 +2034,11 @@ def increment_until_false(lhs, rhs, ctx):
 def index(lhs, rhs, ctx):
     """Element i
     (any, num) -> a[b] (Index)
+    (num, any) -> b[a] (Index)
     (str, str) -> enclose b in a # b[0:len(b)//2] + a + b[len(b)//2:]
     (any, [x]) -> a[:b] (0 to bth item of a)
     (any, [x,y]) -> a[x:y] (x to yth item of a)
     (any, [x,y,m]) -> a[x:y:m] (x to yth item of a, taking every mth)
-    (num, any) -> b[a] (Index)
     """
     ts = vy_type(lhs, rhs)
     lhs = deep_copy(lhs)
@@ -2049,29 +2049,24 @@ def index(lhs, rhs, ctx):
     elif ts == (LazyList, NUMBER_TYPE):
         return lhs[int(rhs)]
 
-    elif ts[-1] == NUMBER_TYPE:
-        if len(iterable(lhs)):
-            return iterable(lhs, ctx=ctx)[int(rhs) % len(iterable(lhs, ctx))]
+    elif ts[1] == NUMBER_TYPE:
+        lhs = iterable(lhs, ctx=ctx)
+        if lhs:
+            return lhs[int(rhs) % len(lhs)]
         else:
             return "" if ts[0] is str else 0
 
     elif ts[0] == NUMBER_TYPE:
         return index(rhs, lhs, ctx)
 
-    elif ts[-1] == str:
+    elif ts[1] == str:
         return vectorise(index, lhs, rhs, ctx=ctx)
 
     else:
-        originally_string = False
-        if isinstance(lhs, str):
-            lhs = LazyList(list(lhs))
-            originally_string = True
-        temp = iterable(lhs, ctx=ctx)[
+        assert len(rhs) <= 3
+        return lhs[
             slice(*[None if vy_type(v) != NUMBER_TYPE else int(v) for v in rhs])
         ]
-        if originally_string:
-            return "".join(temp)
-        return temp
 
 
 def index_indices_or_cycle(lhs, rhs, ctx):