Immutable.js

Posted 2020-10-18 不骄不傲

Immutable.js它内部实现了一套完整的 Persistent Data Structure

 

fromJS()

---

将数组或者对象转换为Immutable

let map=Immutable.fromJS({
        a:1,
        b:2
    });
    let list=Immutable.fromJS([
        {
            a:1,
            b:2
        }
    ]);
    console.log(map);
    console.log(list);

 

is()

---

检测是否相等，和Object.is()是有区别的

let map1=Immutable.Map({a:1});
    let map2=Immutable.Map({a:1});
    console.log(map1===map2);   //false
    console.log(Object.is(map1,map2));  //false
    console.log(Immutable.is(map1,map2));   //true

　　

List是个索引集合

---

 

List.isList() 判断是否为List集合

let list=Immutable.List([1,2,3]);
    console.log(Immutable.List.isList(list));   //true

List.of()创建一个集合

console.log(Immutable.List.of([1,2,3]));

List大小

let list=Immutable.List([1,2,3]);
    console.log(list.size); //3
    console.log(list.count());  //3

获取List索引元素

console.log(list.get(0));
    console.log(list.get(-1));  //反向索引