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diff --git a/help/shiftbefore.md b/help/shiftbefore.md new file mode 100644 index 00000000..ca32833f --- /dev/null +++ b/help/shiftbefore.md @@ -0,0 +1,27 @@ +*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/shiftbefore.html).* + +# Left Pointing Double Angle Quotation (`«`) + +## `« 𝕩`: Shift Before + +Remove the first element of `𝕩`, add a cell of fill values to the end of the first axis of `𝕩`. + + 78 « 1‿2‿3 + + « 1‿2‿3 + + « 3‿3 ⥊ 9 + + + +## `𝕨 « 𝕩`: Shift Before + +Remove the first `≠𝕨` (length) major cells from `𝕩`, join `𝕨` to the end of `𝕩`. Ranks must match. + + 8‿5 « 1‿2‿3 + + a ← 3‿3 ⥊ 9 + + 1‿2‿3 « a + + |
