From 8b115bd20d7a91361a7fe87f293a8a53ff12406c Mon Sep 17 00:00:00 2001
From: Marshall Lochbaum <mwlochbaum@gmail.com>
Date: Sun, 5 Jun 2022 17:19:14 -0400
Subject: Editing continues

---
 doc/pick.md | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

(limited to 'doc/pick.md')

diff --git a/doc/pick.md b/doc/pick.md
index 254c64ec..bc30b930 100644
--- a/doc/pick.md
+++ b/doc/pick.md
@@ -4,7 +4,7 @@
 
 Pick (`⊑`) chooses elements from `𝕩` based on [index](indices.md) lists from `𝕨`. `𝕨` can be a plain list, or even one number if `𝕩` is a list, in order to get one element from `𝕩`. It can also be an array of index lists, or have deeper array structure: each index list will be replaced with the element of `𝕩` at that index, effectively applying to `𝕨` at [depth](depth.md#the-depth-modifier) 1.
 
-With no `𝕨`, monadic `⊑𝕩` takes the first element of `𝕩` in index order, with an error if `𝕩` is empty.
+The one-argument form is called First, and `⊑𝕩` takes the first element of `𝕩` in index order, with an error if `𝕩` is empty.
 
 While sometimes "scatter-point" indexing is necessary, using Pick to select multiple elements from `𝕩` is less array-oriented than [Select](select.md) (`⊏`), and probably slower. Consider rearranging your data so that you can select along axes instead of picking out elements.
 
@@ -21,7 +21,7 @@ A negative number `𝕨` behaves like `𝕨+≠𝕩`, so that `¯1` will select
         ¯2 ⊑ 0‿1‿2‿3‿4
         ¯2 ⊑ "abc"
 
-Making `𝕩` a list is only a special case. In general `𝕨` can be a list of numbers whose length is `𝕩`'s rank. So when `=𝕩` is 1, `𝕨` can be length-1 list. For convenience, a number is also allowed, but not an enclosed number (which could be confused with the nested case).
+Making `𝕩` a list is only a special case. In general `𝕨` can be a list of numbers whose length is `𝕩`'s rank. So when `=𝕩` is 1, `𝕨` can be length-1 list. The case above where `𝕨` is a number is a simplification, but an enclosed number `𝕨` isn't allowed because it could be confused with the nested case described below.
 
         ⟨2,0⟩ ⊑ ↕4‿5
 
@@ -31,22 +31,23 @@ Above we see that picking from the result of [Range](range.md) gives the index.
         2‿0 ⊑ a
         1‿¯1 ⊑ a
 
-This applies even if `𝕩` is a unit. By definition it has rank 0, so the only possible value for `𝕨` is the empty list. This extracts an [enclosed](enclose.md) element, and returns an atom unchanged—the atom is promoted to an array by enclosing it, then the action of Pick undoes this. But there's rarely a reason to use this case, because the monadic form First accomplishes the same thing.
+`𝕩` can even be a [unit](enclose.md#whats-a-unit). By definition it has rank 0, so the only possible value for `𝕨` is the empty list. This extracts an [enclosed](enclose.md) element, and returns an atom unchanged—the atom is promoted to an array by enclosing it, then the action of Pick undoes this. But there's rarely a reason to use this case, because the monadic form First accomplishes the same thing.
 
         ⟨⟩ ⊑ <'a'
         ⟨⟩ ⊑ 'a'
 
 ### First
 
-With no left argument, `⊑` is called First, and performs a slight generalization of Pick with a default left argument `0¨≢𝕩`. For a non-empty array it returns the first element in index order.
+With no left argument, `⊑` is called First, and is the same as Pick with a default left argument `0¨≢𝕩`. For a non-empty array it returns the first element in index order.
 
         ⊑ <'a'
         ⊑ "First"
         ⊑ ↕4‿2‿5‿1
 
-If `𝕩` is empty then First results in an error, like Pick.
+And if `𝕩` is empty then First results in an error.
 
         ⊑ ""
+
         ⊑ ≢π
 
 In APL it's common to get the last element of a list with an idiom that translates to `⊑⌽`, or First-[Reverse](reverse.md). In BQN the most straightforward way is to select with index `¯1` instead. I also sometimes use [Fold](fold.md) with the Right [identity function](identity.md).
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