From 2aaa661cb7fda183a0c63e4320abfd08c78b48e2 Mon Sep 17 00:00:00 2001
From: Kenta Moriuchi <moriken@kimamass.com>
Date: Tue, 26 Jul 2022 00:05:41 +0900
Subject: [PATCH] Remove `Float16Array#spliced`

https://github.com/tc39/proposal-change-array-by-copy/issues/88#issuecomment-1190709637
---
 src/Float16Array.mjs   | 65 ------------------------------------------
 src/_util/messages.mjs |  1 -
 test/Float16Array.js   | 43 ----------------------------
 3 files changed, 109 deletions(-)

diff --git a/src/Float16Array.mjs b/src/Float16Array.mjs
index 05e691cc..20d49674 100644
--- a/src/Float16Array.mjs
+++ b/src/Float16Array.mjs
@@ -17,7 +17,6 @@ import {
   CANNOT_MIX_BIGINT_AND_OTHER_TYPES,
   DERIVED_CONSTRUCTOR_CREATED_TYPEDARRAY_OBJECT_WHICH_WAS_TOO_SMALL_LENGTH,
   ITERATOR_PROPERTY_IS_NOT_CALLABLE,
-  MAXIMUM_ALLOWED_LENGTH_EXCEEDED,
   OFFSET_IS_OUT_OF_BOUNDS,
   REDUCE_OF_EMPTY_ARRAY_WITH_NO_INITIAL_VALUE,
   SPECIES_CONSTRUCTOR_DIDNT_RETURN_TYPEDARRAY_OBJECT,
@@ -29,7 +28,6 @@ import {
   ArrayPrototypeJoin,
   ArrayPrototypePush,
   ArrayPrototypeToLocaleString,
-  MAX_SAFE_INTEGER,
   NativeArrayBuffer,
   NativeObject,
   NativeProxy,
@@ -1026,69 +1024,6 @@ export class Float16Array {
     return /** @type {any} */ (array);
   }
 
-  /** @see https://tc39.es/proposal-change-array-by-copy/#sec-%typedarray%.prototype.toSpliced */
-  toSpliced(start, deleteCount, ...items) {
-    assertFloat16Array(this);
-    const float16bitsArray = getFloat16BitsArray(this);
-
-    const length = TypedArrayPrototypeGetLength(float16bitsArray);
-    const relativeStart = ToIntegerOrInfinity(start);
-
-    let actualStart;
-    if (relativeStart === -Infinity) {
-      actualStart = 0;
-    } else if (relativeStart < 0) {
-      actualStart = length + relativeStart > 0 ? length + relativeStart : 0;
-    } else {
-      actualStart = relativeStart < length ? relativeStart : length;
-    }
-
-    const insertCount = items.length;
-    const converedItems = [];
-    for (let i = 0; i < insertCount; ++i) {
-      converedItems[i] = +items[i];
-    }
-
-    let actualDeleteCount;
-    const argumentLength = arguments.length;
-    if (argumentLength === 0) {
-      actualDeleteCount = 0;
-    } else if (argumentLength === 1) {
-      actualDeleteCount = length - actualStart;
-    } else {
-      const dc = ToIntegerOrInfinity(deleteCount);
-      actualDeleteCount = dc < 0 ? 0 :
-        dc > length - actualStart ? length - actualStart : dc;
-    }
-
-    const newLength = length + insertCount - actualDeleteCount;
-    if (newLength > MAX_SAFE_INTEGER) {
-      throw NativeTypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);
-    }
-
-    // don't use SpeciesConstructor
-    const proxy = new Float16Array(newLength);
-    const array = getFloat16BitsArray(proxy);
-
-    let k = 0;
-    while (k < actualStart) {
-      array[k] = float16bitsArray[k];
-      ++k;
-    }
-
-    for (let i = 0; i < insertCount; ++i) {
-      array[k] = roundToFloat16Bits(converedItems[i]);
-      ++k;
-    }
-
-    while (k < newLength) {
-      array[k] = float16bitsArray[k + actualDeleteCount - insertCount];
-      ++k;
-    }
-
-    return proxy;
-  }
-
   /** @see https://tc39.es/ecma262/#sec-%typedarray%.prototype.subarray */
   subarray(begin, end) {
     assertFloat16Array(this);
diff --git a/src/_util/messages.mjs b/src/_util/messages.mjs
index 831bd878..9786dd5c 100644
--- a/src/_util/messages.mjs
+++ b/src/_util/messages.mjs
@@ -17,5 +17,4 @@ export const CANNOT_MIX_BIGINT_AND_OTHER_TYPES =
 export const ITERATOR_PROPERTY_IS_NOT_CALLABLE = "@@iterator property is not callable";
 export const REDUCE_OF_EMPTY_ARRAY_WITH_NO_INITIAL_VALUE =
   "Reduce of empty array with no initial value";
-export const MAXIMUM_ALLOWED_LENGTH_EXCEEDED = "Maximum allowed length exceeded";
 export const OFFSET_IS_OUT_OF_BOUNDS = "Offset is out of bounds";
diff --git a/test/Float16Array.js b/test/Float16Array.js
index bff9e854..ae1a1798 100644
--- a/test/Float16Array.js
+++ b/test/Float16Array.js
@@ -1809,49 +1809,6 @@ describe("Float16Array", () => {
     });
   });
 
-  describe("#toSpliced()", () => {
-    it("property `name` is 'toSpliced'", () => {
-      assert(Float16Array.prototype.toSpliced.name === "toSpliced");
-    });
-
-    it("property `length` is 2", () => {
-      assert(Float16Array.prototype.toSpliced.length === 2);
-    });
-
-    it("get spliced Array", () => {
-      const float16_1 = new Float16Array([1, 2, 3]);
-      const float16_2 = float16_1.toSpliced();
-
-      assert(float16_1.buffer !== float16_2.buffer);
-      assert.equalFloat16ArrayValues(float16_1, float16_2);
-
-      const float16_3 = float16_1.toSpliced(1);
-
-      assert(float16_1.buffer !== float16_3.buffer);
-      assert.equalFloat16ArrayValues(float16_3, [1]);
-
-      const float16_4 = float16_1.toSpliced(1, -1);
-
-      assert(float16_1.buffer !== float16_4.buffer);
-      assert.equalFloat16ArrayValues(float16_4, [1, 2, 3]);
-
-      const float16_5 = float16_1.toSpliced(1, 10);
-
-      assert(float16_1.buffer !== float16_5.buffer);
-      assert.equalFloat16ArrayValues(float16_5, [1]);
-
-      const float16_6 = float16_1.toSpliced(1, 1);
-
-      assert(float16_1.buffer !== float16_6.buffer);
-      assert.equalFloat16ArrayValues(float16_6, [1, 3]);
-
-      const float16_7 = float16_1.toSpliced(1, 1, 5, 6);
-
-      assert(float16_1.buffer !== float16_7.buffer);
-      assert.equalFloat16ArrayValues(float16_7, [1, 5, 6, 3]);
-    });
-  });
-
   describe("#subarray()", () => {
     it("property `name` is 'subarray'", () => {
       assert(Float16Array.prototype.subarray.name === "subarray");