Class (Int32Array)

import { collections } from '@kit.ArkTS';

// 创建空的Int32Array对象
let int32Array: collections.Int32Array = new collections.Int32Array();

// 以长度参数构造对象
let int32Array: collections.Int32Array = new collections.Int32Array(12);

// 从一个Iterable构造对象
let set: Set<number> = new Set<number>([1, 2, 3]);
// Int32Array [1, 2, 3]
let int32Array: collections.Int32Array = new collections.Int32Array(set);

// 例1 从一个ArrayLike构造对象
let arrayLike = [1, 3, 5];
let int32Array: collections.Int32Array = new collections.Int32Array(arrayLike);

// 例2 从一个ArrayBuffer构造对象
let arrayBuffer: collections.ArrayBuffer = new collections.ArrayBuffer(12);
let int32Array: collections.Int32Array = new collections.Int32Array(arrayBuffer);

// 例3 从另一ArkTS Int32Array构造对象
let arrayLike = [1, 3, 5];
// int32Array1 [1, 3, 5]
let int32Array1: collections.Int32Array = new collections.Int32Array(arrayLike);
// int32Array2 [1, 3, 5]
let int32Array2: collections.Int32Array = new collections.Int32Array(int32Array1);

let int32Array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5, 6]);
console.info("byteLength: " + int32Array.buffer.byteLength); // byteLength: 24
// 从int32Array对应buffer第4个字节开始，长度为5
let int32Array1: collections.Int32Array = new collections.Int32Array(int32Array.buffer, 4, 5);
console.info("[" + int32Array1 + "]"); // [2, 3, 4, 5, 6]

let arrayLike = [1, 3, 5];
let array: collections.Int32Array = collections.Int32Array.from(arrayLike); // array [1, 3, 5]

// 例1 从一个对象创建，Int32Array [0, 1, 2, 3, 4]
let array: collections.Int32Array = collections.Int32Array.from<number>(
  { length: 5 }, (v: Object, k: number) => k);

// 例2 从一个字符数组创建，Int32Array [1, 3, 5]
let array: collections.Int32Array = collections.Int32Array.from<string>(
  ["1", "3", "5"], (v: string, k: number) => parseInt(v));

// 例3 从一个字符串创建，Int32Array [1, 2, 3, 4, 5]
let array: collections.Int32Array = collections.Int32Array.from<string>(
  "12345", (v: string, k: number) => parseInt(v));

// 例1 不指定映射函数
let set: Set<number> = new Set<number>([1, 2, 3]);
// Int32Array [1, 2, 3]
let array: collections.Int32Array = collections.Int32Array.from(set);

// 例2 指定映射函数
let set: Set<number> = new Set<number>([1, 2, 3]);
// Int32Array [1, 3, 5]
let array: collections.Int32Array = collections.Int32Array.from(
  set, (v: number, k: number) => v + k);

// 通过可变参数创建Int32Array对象
let int32Array: collections.Int32Array = collections.Int32Array.of(1, 2, 3, 4);
console.info(int32Array.toString()); // 预期输出：1,2,3,4

let int32Array = new collections.Int32Array([1, 2, 3, 4, 5]);
let stringArray = int32Array.toString();
console.info(stringArray); // 预期输出：1,2,3,4,5

// 当前应用所在系统为法国地区
let array = new collections.Int32Array([1000, 2000, 3000]);
let stringArray = array.toLocaleString();
console.info(stringArray); // 预期输出：1 000,2 000,3 000

let int32Array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5, 6, 7, 8]);
// Int32Array [1, 2, 3, 2, 3, 6, 7, 8]
let copied: collections.Int32Array = int32Array.copyWithin(3, 1, 3);

let arrayLike = [-10, 20, -30, 40, -50];
let int32Array: collections.Int32Array = new collections.Int32Array(arrayLike);
// 判断是否存在小于0的元素
int32Array.some((element: number) => element < 0); // true

let arrayLike = [-10, 20, -30, 40, -50];
let int32Array: collections.Int32Array = new collections.Int32Array(arrayLike);
// 判断是否所有元素都大于0
int32Array.every((element: number) => element > 0);  // false

let arrayLike = [1, 2, 3];
// 使用4填充所有元素
new collections.Int32Array(arrayLike).fill(4); // Int32Array [4, 4, 4]
// 从索引1开始填充4
new collections.Int32Array(arrayLike).fill(4, 1); // Int32Array [1, 4, 4]
// 从索引1到2（不含2）填充4
new collections.Int32Array(arrayLike).fill(4, 1, 2); // Int32Array [1, 4, 3]

let array: collections.Int32Array = collections.Int32Array.from([0, 1, 2, 3, 4]);
// Int32Array [0, 2, 4]
let filtered: collections.Int32Array = array.filter((element: number) => element % 2 == 0);

let array: collections.Int32Array = collections.Int32Array.from([0, 1, 2, 3, 4]);
array.find((element: number) => element > 2); // 3
array.find((element: number) => element > 4); // undefined

const array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let foundIndex: number = array.findIndex((element: number) => element % 2 === 0); // 1

let int32Array: collections.Int32Array = collections.Int32Array.from([1, 2, 3]);
int32Array.forEach((value: number, index: number, array: collections.Int32Array) => {
  console.info("Element " + value + " at index " + index);
});

let array: collections.Int32Array = collections.Int32Array.from([3, 5, 9]);
array.indexOf(3); // 0
array.indexOf(7); // -1
array.indexOf(9, 2); // 2
array.indexOf(9, -2); // 2

let array: collections.Int32Array = collections.Int32Array.from([3, 5, 9]);
console.info(array.lastIndexOf(3) + ''); // 预期输出：0
console.info(array.lastIndexOf(7) + ''); // 预期输出：-1
console.info(array.lastIndexOf(9, 2) + ''); // 预期输出：2
console.info(array.lastIndexOf(9, -2) + ''); // 预期输出：-1

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let joined: string = array.join('-'); // "1-2-3-4-5"

let array: collections.Int32Array = collections.Int32Array.from([25, 36, 49]);
const mapped: collections.Int32Array = array.map(Math.sqrt); // Int32Array [5, 6, 7]

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
// reducedValue == 15
let reducedValue: number = array.reduce((accumulator: number, value: number) => accumulator + value);

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let reducedValue: number = array.reduceRight((accumulator: number, value: number) => accumulator + value);
console.info(reducedValue + ''); // 预期输出：15

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
// reducedValue == 16
let reducedValue: number = array.reduce((accumulator: number, value: number) => accumulator + value, 1);

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let reducedValue: number = array.reduceRight((accumulator: number, value: number) => accumulator + value, 1);
console.info(reducedValue + ''); // 预期输出：16

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
// reducedValue == initialValue12345
let reducedValue: string = array.reduce<string>((accumulator: string, value: number) => accumulator + value, "initialValue");

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let reversed: collections.Int32Array = array.reverse(); // Int32Array [5, 4, 3, 2, 1]

let buffer: collections.ArrayBuffer = new collections.ArrayBuffer(32);
let array: collections.Int32Array = new collections.Int32Array(buffer);
array.set([1, 2, 3], 3); // Int32Array [0, 0, 0, 1, 2, 3, 0, 0]

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
array.slice(); // Int32Array [1, 2, 3, 4, 5]
array.slice(1, 3); // Int32Array [2, 3]
array.slice(-2); // Int32Array [4, 5]

let array: collections.Int32Array = collections.Int32Array.from([1, 3, 5, 4, 2]);
// 默认升序排序
array.sort(); // Int32Array [1, 2, 3, 4, 5]
// 使用比较函数升序排序
array.sort((first: number, second: number) => first - second); // Int32Array [1, 2, 3, 4, 5]
// 使用比较函数降序排序
array.sort((first: number, second: number) => second - first); // Int32Array [5, 4, 3, 2, 1]

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let subArray: collections.Int32Array = array.subarray(); // Int32Array [1, 2, 3, 4, 5]
subArray.set([10, 20, 30]); // Int32Array [10, 20, 30, 4, 5]

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
console.info("element: " + array.at(2));  // element: 3
console.info("element: " + array.at(-1)); // element: 5
console.info("element: " + array.at(6));  // element: undefined

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3]);
console.info("includes: " + array.includes(2));    // includes: true
console.info("includes: " + array.includes(4));    // includes: false
console.info("includes: " + array.includes(3, 3)); // includes: false

let array: collections.Int32Array = collections.Int32Array.from([11, 22, 33]);
let iterator: IterableIterator<[number, number]> = array.entries();
console.info("value: " + iterator.next().value); // value: 0,11
console.info("value: " + iterator.next().value); // value: 1,22
console.info("value: " + iterator.next().value); // value: 2,33

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let iterator: IterableIterator<number> = array.keys();
for (const key of iterator) {
  console.info("" + key); // 依次输出 0,1,2,3,4
}

let array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5]);
let iterator: IterableIterator<number> = array.values();
for (const value of iterator) {
  console.info("" + value); // 依次输出 1,2,3,4,5
}

let int32Array: collections.Int32Array = collections.Int32Array.from([1, 2, 3, 4, 5, 6]);
// 通过迭代器遍历Int32Array
for (let item of int32Array) {
  console.info("value : " + item);
}

let int32Array = collections.Int32Array.from([1, 2, 4]);
// 通过索引访问Int32Array的元素
console.info("Element at index 1: ", int32Array[1]);