Initial data commit

Task/Balanced-brackets/Excel/balanced-brackets-2.excel

@@ -0,0 +1,110 @@
+APPENDCOLS
+=LAMBDA(xs,
+    LAMBDA(ys,
+        LET(
+            nx, COLUMNS(xs),
+            colIndexes, SEQUENCE(1, nx + COLUMNS(ys)),
+            rowIndexes, SEQUENCE(MAX(ROWS(xs), ROWS(ys))),
+
+            IFERROR(
+                IF(nx < colIndexes,
+                    INDEX(ys, rowIndexes, colIndexes - nx),
+                    INDEX(xs, rowIndexes, colIndexes)
+                ),
+                NA()
+            )
+        )
+    )
+)
+
+
+CHARSROW
+=LAMBDA(s,
+    MID(s,
+        SEQUENCE(1, LEN(s), 1, 1),
+        1
+    )
+)
+
+
+HEADCOL
+=LAMBDA(xs,
+    LET(REM, "The first item of each column in xs",
+
+        INDEX(xs, 1, SEQUENCE(1, COLUMNS(xs)))
+    )
+)
+
+
+HEADROW
+=LAMBDA(xs,
+    LET(REM, "The first item of each row in xs",
+
+        INDEX(
+            xs,
+            SEQUENCE(ROWS(xs)),
+            SEQUENCE(1, 1)
+        )
+    )
+)
+
+
+LASTCOL
+=LAMBDA(xs,
+    INDEX(
+        xs,
+        SEQUENCE(ROWS(xs), 1, 1, 1),
+        COLUMNS(xs)
+    )
+)
+
+
+SCANLCOLS
+=LAMBDA(op,
+    LAMBDA(a,
+        LAMBDA(xs,
+            APPENDCOLS(a)(
+                LET(
+                    b, op(a, HEADROW(xs)),
+
+                    IF(2 > COLUMNS(xs),
+                        b,
+                        SCANLCOLS(op)(b)(
+                            TAILROW(xs)
+                        )
+                    )
+                )
+            )
+        )
+    )
+)
+
+
+TAILCOL
+=LAMBDA(cols,
+    LET(REM, "The tail of each column in the grid.",
+
+        INDEX(
+            cols,
+            SEQUENCE(ROWS(cols) - 1, 1, 2, 1),
+            SEQUENCE(1, COLUMNS(cols))
+        )
+    )
+)
+
+
+TAILROW
+=LAMBDA(xs,
+    LET(REM,"The tail of each row in the grid",
+        n, COLUMNS(xs) - 1,
+
+        IF(0 < n,
+            INDEX(
+                xs,
+                SEQUENCE(ROWS(xs), 1, 1, 1),
+                SEQUENCE(1, n, 2, 1)
+            ),
+            NA()
+        )
+    )
+)