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es-optional

v1.0.1

Published

CHKUI-SITE

Downloads

1

Readme

ES-Optional


JavaScript(ES)实现Java Optional对象相关的方法。用于“非”数据的函数式判断。


##使用方法: 安装:

npm install es-options --save-dev

使用:

import {fluent} from 'es-optional'
fluent(null).else('null');

说明: 提供类似于Java Optional的函数式null数据异常判断。不过这里除了null还会将JavaScript中定义的非数据——0falsenullundefined判断为错误数据。


函数式判断:

fluent({key:'value'}). //初始化数据为{key:'value'}
then((obj)=>{
    return obj.key; //提取对象中key的值
}).else('error'); //如果出现非数据,则返回'error'

函数式处理:

fluent({key:{key:'value'}}). //初始化数据为{key:'value'}
then((obj)=>{
    return obj.key;
}).then((obj)=>{
    return obj.key;
}).else('error'); //如果出现非数据,则返回'error'

在整个处理链条上,任何一个then中出现异常数据则返回else中指定的数据:

fluent({key:{key:'value'}}). //初始化数据为{key:'value'}
then((obj)=>{
    return obj.key;
}).then((obj)=>{
    return obj.key1;
}).else('error'); //则返回'error'

获取处理链条上任何一个认为返回的数据:

fluent(0). //初始化数据为{key:'value'}
then((obj)=>{
    return 1;
}).then(2).then(3).then((obj, chain)=>{
    //chain 是一个列表:[0,1,2,3]
    return chain;
}).else('error'); //则返回'error'