Loogle!

Result

Found 8 declarations mentioning Std.Iterators.Iter.map.

• Std.Iterators.Iter.map 📋 Init.Data.Iterators.Combinators.FilterMap
  {α β γ : Type w} [Std.Iterators.Iterator α Id β] (f : β → γ) (it : Std.Iter β) : Std.Iter γ
• Std.Iterators.Iter.map_eq_toIter_map_toIterM 📋 Init.Data.Iterators.Lemmas.Combinators.FilterMap
  {α β γ : Type w} [Std.Iterators.Iterator α Id β] {it : Std.Iter β} {f : β → γ} : Std.Iterators.Iter.map f it = (Std.Iterators.IterM.map f it.toIterM).toIter
• Std.Iterators.Iter.toListRev_map 📋 Init.Data.Iterators.Lemmas.Combinators.FilterMap
  {α β γ : Type w} [Std.Iterators.Iterator α Id β] {it : Std.Iter β} [Std.Iterators.IteratorCollect α Id Id] [Std.Iterators.LawfulIteratorCollect α Id Id] [Std.Iterators.Finite α Id] {f : β → γ} : (Std.Iterators.Iter.map f it).toListRev = List.map f it.toListRev
• Std.Iterators.Iter.toArray_map 📋 Init.Data.Iterators.Lemmas.Combinators.FilterMap
  {α β γ : Type w} [Std.Iterators.Iterator α Id β] {it : Std.Iter β} [Std.Iterators.IteratorCollect α Id Id] [Std.Iterators.LawfulIteratorCollect α Id Id] [Std.Iterators.Finite α Id] {f : β → γ} : (Std.Iterators.Iter.map f it).toArray = Array.map f it.toArray
• Std.Iterators.Iter.toList_map 📋 Init.Data.Iterators.Lemmas.Combinators.FilterMap
  {α β γ : Type w} [Std.Iterators.Iterator α Id β] {it : Std.Iter β} [Std.Iterators.IteratorCollect α Id Id] [Std.Iterators.LawfulIteratorCollect α Id Id] [Std.Iterators.Finite α Id] {f : β → γ} : (Std.Iterators.Iter.map f it).toList = List.map f it.toList
• Std.Iterators.Iter.step_map 📋 Init.Data.Iterators.Lemmas.Combinators.FilterMap
  {α β γ : Type w} [Std.Iterators.Iterator α Id β] {it : Std.Iter β} {f : β → γ} : (Std.Iterators.Iter.map f it).step = match it.step with | ⟨Std.Iterators.IterStep.yield it' out, h⟩ => Std.Iterators.PlausibleIterStep.yield (Std.Iterators.Iter.map f it') (f out) ⋯ | ⟨Std.Iterators.IterStep.skip it', h⟩ => Std.Iterators.PlausibleIterStep.skip (Std.Iterators.Iter.map f it') ⋯ | ⟨Std.Iterators.IterStep.done, h⟩ => Std.Iterators.PlausibleIterStep.done ⋯
• Std.Slice.Array.internalIter_eq 📋 Init.Data.Slice.Array.Lemmas
  {α : Type u} {s : Subarray α} : Std.Slice.Internal.iter s = Std.Iterators.Iter.map (fun x => match x with | { down := i } => s.array[↑i]) ((Std.PRange.Internal.iter { lower := s.start, upper := s.stop }).attachWith (fun x => x < s.array.size) ⋯).uLift
• Std.Slice.Array.toList_internalIter 📋 Init.Data.Slice.Array.Lemmas
  {α : Type u} {s : Subarray α} : (Std.Slice.Internal.iter s).toList = List.map (fun i => s.array[↑i]) ({ lower := s.start, upper := s.stop }.toList.attachWith (fun x => x < s.array.size) ⋯)

About

Loogle searches Lean and Mathlib definitions and theorems.

You can use Loogle from within the Lean4 VSCode language extension using (by default) Ctrl-K Ctrl-S. You can also try the #loogle command from LeanSearchClient, the CLI version, the Loogle VS Code extension, the lean.nvim integration or the Zulip bot.

Usage

Loogle finds definitions and lemmas in various ways:

1. By constant:
   🔍 Real.sin
   finds all lemmas whose statement somehow mentions the sine function.

2. By lemma name substring:
   🔍 "differ"
   finds all lemmas that have "differ" somewhere in their lemma name.

3. By subexpression:
   🔍 _ * (_ ^ _)
   finds all lemmas whose statements somewhere include a product where the second argument is raised to some power.

   The pattern can also be non-linear, as in
   🔍 Real.sqrt ?a * Real.sqrt ?a

   If the pattern has parameters, they are matched in any order. Both of these will find List.map:
   🔍 (?a -> ?b) -> List ?a -> List ?b
   🔍 List ?a -> (?a -> ?b) -> List ?b

4. By main conclusion:
   🔍 |- tsum _ = _ * tsum _
   finds all lemmas where the conclusion (the subexpression to the right of all → and ∀) has the given shape.

   As before, if the pattern has parameters, they are matched against the hypotheses of the lemma in any order; for example,
   🔍 |- _ < _ → tsum _ < tsum _
   will find tsum_lt_tsum even though the hypothesis f i < g i is not the last.

If you pass more than one such search filter, separated by commas Loogle will return lemmas which match all of them. The search
🔍 Real.sin, "two", tsum, _ * _, _ ^ _, |- _ < _ → _
would find all lemmas which mention the constants Real.sin and tsum, have "two" as a substring of the lemma name, include a product and a power somewhere in the type, and have a hypothesis of the form _ < _ (if there were any such lemmas). Metavariables (?a) are assigned independently in each filter.

The #lucky button will directly send you to the documentation of the first hit.

Source code

You can find the source code for this service at https://github.com/nomeata/loogle. The https://loogle.lean-lang.org/ service is provided by the Lean FRO.

This is Loogle revision ff04530 serving mathlib revision 8623f65