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Embeer.js EmberArray reduce()用法及代码示例


Ember.js 是一个开源 JavaScript 框架，用于开发基于 Model-View-Controller (MVC) 架构的大型客户端 Web 应用程序。 Ember.js是使用最广泛的前端应用框架之一。它的目的是加速开发并提高生产力。目前，它被大量网站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

reduce() 方法用于将枚举数组合成单个值。这是从枚举器收集汇总值的有用方法。

用法:

reduce( callback, initialValue, reducerProperty );

参数：

  • callback: 这是将在每个函数上执行的回调。
  • initialValue: 它是减速器的初始值。
  • reducerProperty: 仅供内部使用。

返回值：降低的值。

安装和擦除 Ember.js 代码的步骤：

要运行以下示例，您需要有一个 ember 项目。要创建一个，您需要先安装ember-cli。在终端中写入以下代码：

npm install ember-cli

现在您可以通过输入以下代码来创建项目：

ember new <project-name> --lang en

要启动服务器，请键入：

ember serve

示例 1：键入以下代码以生成本示例的路由：

ember generate route reduce1

应用程序/路由/reduce1.js


import Route from '@ember/routing/route'; 
  
export default class DetailsRoute 
    extends Route { 
    details = [ 
        { 
            name: 'Aaksh', 
            mobile: '9811129967', 
            city: 'Delhi', 
            country: 'India', 
            gender: 'M', 
            zipCode: '800020', 
        }, 
        { 
            name: 'Sweta', 
            mobile: '9456712890', 
            city: 'Mumbai', 
            country: 'India', 
            gender: 'F', 
            zipCode: '400001', 
        }, 
        { 
            name: 'Satyam', 
            mobile: '2222222222', 
            city: 'Raipur', 
            country: 'India', 
            gender: 'M', 
            zipCode: '110012', 
        }, 
        { 
            name: 'Shandya', 
            mobile: '1122113322', 
            city: 'Bangalore', 
            country: 'India', 
            gender: 'F', 
            zipCode: '530068', 
        }, 
        { 
            name: 'Ayushi', 
            mobile: '2244668800', 
            city: 'Thana', 
            country: 'India', 
            gender: 'F', 
            zipCode: '302001', 
        }, 
    ]; 
    someMoreDetails = [ 
        { 
            name: 'Yogesh', 
            mobile: '1133557799', 
            city: 'Chennai', 
            country: 'India', 
            gender: 'F', 
            zipCode: '600001', 
        }, 
        { 
            name: 'Sunny', 
            mobile: '9911000000', 
            city: 'Mysore', 
            country: 'India', 
            gender: 'M', 
            zipCode: '574142', 
        }, 
        { 
            name: 'Khushi', 
            mobile: '8888888888', 
            city: 'Pune', 
            country: 'India', 
            gender: 'F', 
            zipCode: '111045', 
        }, 
    ]; 
    city; 
    name; 
    code; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
        controller.set('someMoreDetails', 
            this.someMoreDetails); 
        controller.set('city', this.city); 
        controller.set('code', this.code); 
        controller.set('name', this.name); 
    } 
}

应用程序/控制器/reduce1.js


import Ember from 'ember'; 
import { addObjects, shiftObject, setEach } 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        checkCity(city) { 
            let foo = this.details. 
                reduce((acc, person) => 
                person.city == this.city ? 
                acc + person.name : acc, ''); 
            foo ? alert(`${foo}  is from ${city} `)  
            : alert(`No one from ${city}`); 
        }, 
        checkName(name) { 
            let foo = this.details.reduce((acc, person)  
             => person.name == this.name ? 
             acc + person.city : acc, ''); 
            foo ? alert(`${name} from ${foo} `)  
            : alert(`No one of ${name}`); 
        }, 
        checkCode(code) { 
            let foo = this.details.reduce((acc, person)  
            => person.zipCode == this.code  
            ? acc + person.name : acc, ''); 
            foo ? alert(`${foo} from ${code} `)  
            : alert(`No one of ${code}`); 
        }, 
    }, 
});

应用程序/模板/reduce1.hbs


{{page-title "Details"}} 
<h3>List of People: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Gender</th> 
        <th>Mobile</th> 
        <th>City</th> 
        <th>Country</th> 
        <th>Zip Code</th> 
    </tr> 
    {{#each @model as |detail|}} 
    <tr> 
        <td>{{detail.name}}</td> 
        <td>{{detail.gender}}</td> 
        <td>{{detail.mobile}}</td> 
        <td>{{detail.city}}</td> 
        <td>{{detail.country}}</td> 
        <td>{{detail.zipCode}}</td> 
    </tr> 
    {{/each}} 
</table> 
  
<br /><br /> 
<div> 
    <label>Enter City: </label> 
    {{input value=this.city}} 
</div> 
<div> 
    <input type="button" id="check-city" 
        value="Check Someone from City" 
        {{action 'checkCity' this.city}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter zipCode: </label> 
    {{input value=this.code}} 
</div> 
<div> 
    <input type="button" id="check-code" 
        value="Check Someone from Zip-Code" 
        {{action 'checkCode' this.code}} /> 
</div><br /><br /> 
<div> 
    <label>Enter Name: </label> 
    {{input value=this.name}} 
</div> 
<div> 
    <input type="button" id="check-name" 
        value="Check Someone by Name" 
        {{action 'checkName' this.name}} /> 
</div> 
{{outlet}}
  • Output: 访问 localhost:4200/reduce1 查看输出

Ember.js EmberArray 减少方法

示例 2：键入以下代码以生成本示例的路由：

ember generate route reduce2

应用程序/路由/reduce2.js


import Route from '@ember/routing/route'; 
import { } from '@ember/array'; 
  
export default class FruitsRoute 
    extends Route { 
    item1 = [ 
        { 
            name: 'Apple', 
            isFruit: true, 
            color: 'red', 
        }, 
        { 
            name: 'Grapes', 
            isFruit: true, 
            color: 'green', 
        }, 
        { 
            name: 'Mango', 
            isFruit: true, 
            color: 'yellow', 
        }, 
        { 
            name: 'Watermelon', 
            isFruit: true, 
            color: 'red', 
        }, 
        { 
            name: 'Orange', 
            isFruit: true, 
            color: 'orange', 
        }, 
  
    ]; 
    item2 = [ 
        { 
            name: 'Lady Finger', 
            isFruit: false, 
            color: 'green', 
        }, 
        { 
            name: 'Brinjal', 
            isFruit: false, 
            color: 'purple', 
        }, 
        { 
            name: 'Potato', 
            isFruit: false, 
            color: 'brown', 
        }, 
        { 
            name: 'Onion', 
            isFruit: false, 
            color: 'violet', 
        }, 
    ]; 
    model() { 
        return this.item1; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('item1', this.item1); 
        controller.set('item2', this.item2); 
    } 
}

应用程序/控制器/reduce2.js


import Ember from 'ember'; 
import { pushObjects, isAny } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        Check_item() { 
            let ans = this.item1.reduce((acc, item ) 
            => item.isFruit == true ? acc + 
            '\n' + item.name  : acc, ''); 
            ans ? alert(`Yes it contains Fruit${ans}`) 
                : alert(`It doesn't contains any Fruit`) 
        }, 
        Check_item2() { 
            let ans = this.item1.reduce((acc, item )  
            => item.isFruit == false ? acc  
            + '\n' + item.name  : acc, ''); 
            ans ? alert(`Yes it contains Vegatabe ${ans}`) : 
                alert(`It doesn't contains any Vegetable`) 
        }, 
        pushMoreDetails() { 
            this.item1.pushObjects(this.item2); 
        }, 
    }, 
});

应用程序/模板/reduce2.hbs


{{page-title "Fruits"}} 
<table style=" border-spacing : 30px"> 
    <h3>Here is a Bucket: </h3> 
    <ul> 
        {{#each @model as |eatable|}} 
        <li>{{eatable.name}}</li> 
        {{/each}} 
    </ul> 
</table> 
<br /><br /> 
<input type="button" id="fruit-all" 
    value="List Contains Any Fruit?" 
    {{action 'Check_item' }} /> 
<br /><br /> 
<input type="button" id="fruit-notAll" 
    value="List Contains Any Vegetables?" 
    {{action 'Check_item2' }} /> 
  
<br /><br /> 
<input type="button" id="push-details" 
    value="Add More Details" 
    {{action 'pushMoreDetails' }} /> 
{{outlet}}
  • Output: 访问 localhost:4200/reduce2 查看输出

Ember.js EmberArray 减少方法

参考：https://api.emberjs.com/ember/2.14/classes/Ember.Array/methods/reduce?anchor=reduce



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注：本文由纯净天空筛选整理自satyam00so大神的英文原创作品 Ember.js EmberArray reduce() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。