Underscore.JS - findWhere 方法

语法

_.findWhere(list, properties)

逐个遍历列表中的每个值，返回与 properties 中列出的键-值对匹配的第一个匹配对。

示例

var _ = require('underscore');

var list = [{"title": "Learn Java", "Author": "Sam", "Cost": 100},
   {"title": "Learn Scala", "Author": "Joe", "Cost": 200},
   {"title": "Learn C", "Author": "Sam", "Cost": 200} ]
   
//Example 1. find a book whose author is Sam
var result = _.findWhere(list, { "Author": "Sam" });
console.log(result);

//Example 2. find a book whose cost is 200
var result = _.findWhere(list, { "Cost": 200 });
console.log(result);

将上述程序保存在 tester.js 中。运行以下命令来执行此程序。

命令

\>node tester.js

输出

{ title: 'Learn Java', Author: 'Sam', Cost: 100 }
{ title: 'Learn Scala', Author: 'Joe', Cost: 200 }