Move 中的向量（Vector）提供灵活的动态数组式数据结构，支持索引、添加和移除元素等多种操作。Move 向量可增长，并支持从 0 开始的索引。
向量的核心功能
Section titled “向量的核心功能”vector 模块提供各种原生函数和 Move 函数来管理动态数组：
empty：创建空向量。length：返回向量长度。borrow：返回给定索引处元素的不可变引用。push_back：在向量末尾添加元素。borrow_mut：返回给定索引处元素的可变引用。pop_back：移除并返回向量的最后一个元素。destroy_empty：销毁空向量。swap：交换给定两个索引处的元素。
以下常量定义模块中使用的错误代码：
EINDEX_OUT_OF_BOUNDS：0x20000
API 概览
Section titled “API 概览”empty<Element>(): vector<Element>：创建空向量。singleton<Element>(e: Element): vector<Element>：创建包含单个元素的向量。
push_back<Element>(v: &mut vector<Element>, e: Element)：在向量末尾添加元素。pop_back<Element>(v: &mut vector<Element>): Element：移除并返回向量的最后一个元素。remove<Element>(v: &mut vector<Element>, i: u64): Element：移除指定索引处的元素，并移动后续元素。swap_remove<Element>(v: &mut vector<Element>, i: u64): Element：将给定索引处的元素与最后一个元素交换后移除。
borrow<Element>(v: &vector<Element>, i: u64): &Element：返回给定索引处元素的不可变引用。borrow_with_default<Element>(v: &vector<Element>, i: u64, default: &Element): &Element：若索引越界，则返回元素引用或默认值。borrow_mut<Element>(v: &mut vector<Element>, i: u64): &mut Element：返回给定索引处元素的可变引用。
length<Element>(v: &vector<Element>): u64：返回向量中的元素数。is_empty<Element>(v: &vector<Element>): bool：检查向量是否为空。contains<Element>(v: &vector<Element>, e: &Element): bool：检查向量是否包含给定元素。index_of<Element>(v: &vector<Element>, e: &Element): (bool, u64)：若找到给定元素，返回其索引。reverse<Element>(v: &mut vector<Element>)：反转向量中元素的顺序。append<Element>(lhs: &mut vector<Element>, other: vector<Element>)：将一个向量的所有元素追加到另一个向量。for_each<Element>(v: vector<Element>, f: |Element|)：对向量中每个元素应用函数。for_each_ref<Element>(v: &vector<Element>, f: |&Element|)：对向量中每个元素的引用应用函数。for_each_mut<Element>(v: &mut vector<Element>, f: |&mut Element|)：对向量中每个元素的可变引用应用函数。fold<Accumulator, Element>(v: vector<Element>, init: Accumulator, f: |Accumulator, Element|Accumulator): Accumulator：应用函数以累积向量元素的值。map<Element, NewElement>(v: vector<Element>, f: |Element|NewElement): vector<NewElement>：将函数映射到向量元素，生成新向量。filter<Element: drop>(v: vector<Element>, p: |&Element|bool): vector<Element>：使用谓词函数筛选向量。
创建并使用向量
Section titled “创建并使用向量”module 0x42::vector_usage { use std::vector;
public entry fun main() { let v = vector::empty<u64>(); vector::push_back(&mut v, 10); vector::push_back(&mut v, 20);
let length = vector::length(&v); assert!(length == 2, 0);
let first_elem = vector::borrow(&v, 0); assert!(*first_elem == 10, 0);
let second_elem = vector::borrow(&v, 1); assert!(*second_elem == 20, 0);
let last_elem = vector::pop_back(&mut v); assert!(last_elem == 20, 0);
vector::destroy_empty(v); }}module 0x42::vector_usage { use std::vector;
public fun append_vectors() { let v1 = vector::empty<u64>(); let v2 = vector::empty<u64>();
vector::push_back(&mut v1, 1); vector::push_back(&mut v1, 2);
vector::push_back(&mut v2, 3); vector::push_back(&mut v2, 4);
vector::append(&mut v1, v2);
let length = vector::length(&v1); assert!(length == 4, 0);
let first_elem = vector::borrow(&v1, 0); assert!(*first_elem == 1, 0);
let second_elem = vector::borrow(&v1, 1); assert!(*second_elem == 2, 0);
let third_elem = vector::borrow(&v1, 2); assert!(*third_elem == 3, 0);
let fourth_elem = vector::borrow(&v1, 3); assert!(*fourth_elem == 4, 0); }}module 0x42::vector_usage { use std::vector;
public fun remove_elements() { let v = vector::empty<u64>();
vector::push_back(&mut v, 1); vector::push_back(&mut v, 2); vector::push_back(&mut v, 3);
let removed_elem = vector::remove(&mut v, 1); assert!(removed_elem == 2, 0);
let length = vector::length(&v); assert!(length == 2, 0);
let first_elem = vector::borrow(&v, 0); assert!(*first_elem == 1, 0);
let second_elem = vector::borrow(&v, 1); assert!(*second_elem == 3, 0); }}module 0x42::vector_usage { use std::vector;
public fun swap_elements() { let v = vector::empty<u64>();
vector::push_back(&mut v, 1); vector::push_back(&mut v, 2); vector::push_back(&mut v, 3);
vector::swap(&mut v, 0, 2);
let first_elem = vector::borrow(&v, 0); assert!(*first_elem == 3, 0);
let third_elem = vector::borrow(&v, 2); assert!(*third_elem == 1, 0); }}