Data commit

Task/Palindrome-detection/Excel/palindrome-detection-1.excel

@@ -0,0 +1,11 @@
+ISPALINDROME
+=LAMBDA(s,
+    LET(
+        lcs, FILTERP(
+            LAMBDA(c, " " <> c)
+        )(
+            CHARS(LOWER(s))
+        ),
+        CONCAT(lcs) = CONCAT(REVERSE(lcs))
+    )
+)

Task/Palindrome-detection/Excel/palindrome-detection-2.excel

@@ -0,0 +1,24 @@
+CHARS
+=LAMBDA(s,
+    MID(s, ROW(INDIRECT("1:" & LEN(s))), 1)
+)
+
+
+FILTERP
+=LAMBDA(p,
+    LAMBDA(xs,
+        FILTER(xs, p(xs))
+    )
+)
+
+
+REVERSE
+=LAMBDA(xs,
+    LET(
+        n, ROWS(xs),
+        SORTBY(
+            xs,
+            SEQUENCE(n, 1, n, -1)
+        )
+    )
+)