# `⍀` — Scan first

Monadic operator. Keys: `Alt-Minus Backslash`

`f⍀Y` scans down the first axis.

``` bpl
+⍀[1 2 3⋄4 5 6]  ⍝ [1 2 3⋄5 7 9]
```

`S f⍀ Y` supplies a seed.

``` bpl
10+⍀[1 2⋄3 4]    ⍝ [11 12⋄14 16]
```

Seeds, `⍠K` and errors follow [`\`](backslash.qmd).

## Inverse

`f⍀⁻¹` undoes `f⍀` when `f` has an inverse.

``` bpl
×⍀⁻¹[1 2⋄3 8]   ⍝ [1 2⋄3 4]
```