README.md

@@ -58,8 +58,6 @@ isum(i1); // 6
 icat(iarray(["a", "b", "c"])); // abc
 imin(i1); // 1
 imax(i1); // 3
-iminBy(i1, (x) => -x); // 3
-imaxBy(i1, (x) => -x); // 1
 
 // Transform iterables
 iloop(i1); // 1 2 3 1 2 3 ...
@@ -69,7 +67,6 @@ ifilter(i3, (x) => x % 4 == 0); // 0 -4 -8 -12 ...
 imapfilter(i1, (x) => x != 4 ? x * 2 : null); // 2 6
 ipartition(i3, (x) => x % 4 == 0); // [0 -4 -8 ..., -1 -2 -3 -5 ...]
 iunique(iarray([1, 4, 2, 4, 3, 1, 5])); // 1 4 2 3 5
-ienumerate(iarray(["a", "b", "c"])); // [0, "a"] [1, "b"] [2, "c"]
 
 // Combine iterables
 ichain(i1, i2); // 1 2 3 4

doc/use.md

@@ -24,8 +24,6 @@ isum(i1); // 6
 icat(iarray(["a", "b", "c"])); // abc
 imin(i1); // 1
 imax(i1); // 3
-iminBy(i1, (x) => -x); // 3
-imaxBy(i1, (x) => -x); // 1
 
 // Transform iterables
 iloop(i1); // 1 2 3 1 2 3 ...
@@ -35,7 +33,6 @@ ifilter(i3, (x) => x % 4 == 0); // 0 -4 -8 -12 ...
 imapfilter(i1, (x) => x != 4 ? x * 2 : null); // 2 6
 ipartition(i3, (x) => x % 4 == 0); // [0 -4 -8 ..., -1 -2 -3 -5 ...]
 iunique(iarray([1, 4, 2, 4, 3, 1, 5])); // 1 4 2 3 5
-ienumerate(iarray(["a", "b", "c"])); // [0, "a"] [1, "b"] [2, "c"]
 
 // Combine iterables
 ichain(i1, i2); // 1 2 3 4

mod.test.ts

@@ -8,7 +8,6 @@ import {
   ichainit,
   icombine,
   IEMPTY,
-  ienumerate,
   ifilter,
   ifilterclass,
   ifiltertype,
@@ -21,9 +20,7 @@ import {
   imapfilter,
   imaterialize,
   imax,
-  imaxBy,
   imin,
-  iminBy,
   ipartition,
   irange,
   irecur,
@@ -287,15 +284,6 @@ describe("Iterators", () => {
     ]);
   });
 
-  it("enumerate iterators", () => {
-    let iterator = ienumerate(iarray(["a", "b", "c"]));
-    checkit(iterator, [
-      [0, "a"],
-      [1, "b"],
-      [2, "c"],
-    ]);
-  });
-
   it("zips iterators", () => {
     checkit(izip(IEMPTY, IEMPTY), []);
     checkit(izip(iarray([1, 2, 3]), iarray(["a", "b"])), [[1, "a"], [
@@ -352,11 +340,5 @@ describe("Iterators", () => {
 
     expect(imax(IEMPTY)).toEqual(-Infinity);
     expect(imax(iarray([3, 8, 2, 4]))).toEqual(8);
-
-    expect(iminBy(IEMPTY, (x) => x)).toBeUndefined();
-    expect(iminBy(["aaa", "b", "cc"], (x) => x.length)).toEqual("b");
-
-    expect(imaxBy(IEMPTY, (x) => x)).toBeUndefined();
-    expect(imaxBy(["aaa", "b", "cc"], (x) => x.length)).toEqual("aaa");
   });
 });

mod.ts

@@ -390,24 +390,6 @@ export function icombine<T1, T2>(
   return ichainit(imap(it1, (v1) => imap(it2, (v2): [T1, T2] => [v1, v2])));
 }
 
-/**
- * Enumerate another iterable, adding the index before the value.
- */
-export function ienumerate<T>(it: Iterable<T>): Iterable<[number, T]> {
-  return {
-    [Symbol.iterator]: function* () {
-      const iterator = it[Symbol.iterator]();
-      let state = iterator.next();
-      let idx = 0;
-      while (!state.done) {
-        yield [idx, state.value];
-        state = iterator.next();
-        idx += 1;
-      }
-    },
-  };
-}
-
 /**
  * Advance through two iterables at the same time, yielding item pairs
  *
@@ -534,27 +516,3 @@ export const imin = (iterable: Iterable<number>) =>
   ireduce(iterable, Math.min, Infinity);
 export const imax = (iterable: Iterable<number>) =>
   ireduce(iterable, Math.max, -Infinity);
-
-/**
- * Min/max by key function
- */
-export function iminBy<T>(
-  iterable: Iterable<T>,
-  key: (value: T) => number,
-): T | undefined {
-  return ireduce(
-    iterable,
-    (item1, item2) =>
-      (typeof item1 == "undefined" || typeof item2 == "undefined") ||
-        (key(item1) > key(item2))
-        ? item2
-        : item1,
-    undefined,
-  );
-}
-export function imaxBy<T>(
-  iterable: Iterable<T>,
-  key: (value: T) => number,
-): T | undefined {
-  return iminBy(iterable, (value) => -key(value));
-}