如何确定Javascript数组是否包含具有等于给定值的属性的对象? [英] How to determine if Javascript array contains an object with an attribute that equals a given value?

问题描述

我有一个类似的数组

vendors = [{
    Name: 'Magenic',
    ID: 'ABC'
  },
  {
    Name: 'Microsoft',
    ID: 'DEF'
  } // and so on... 
];

如何检查此数组以查看Magenic"是否存在存在吗?我不想循环，除非我必须.我正在处理可能有几千条记录.

How do I check this array to see if "Magenic" exists? I don't want to loop, unless I have to. I'm working with potentially a couple thousand records.

推荐答案

2018 edit:这个答案是从 2011 年开始的，在浏览器广泛支持数组过滤方法和箭头函数之前.看看 CAFxX 的回答.

2018 edit: This answer is from 2011, before browsers had widely supported array filtering methods and arrow functions. Have a look at CAFxX's answer.

没有神奇"的方法可以在没有循环的情况下检查数组中的某些内容.即使您使用某个函数，该函数本身也会使用循环.您可以做的是在找到所需内容后立即跳出循环，以最大限度地减少计算时间.

There is no "magic" way to check for something in an array without a loop. Even if you use some function, the function itself will use a loop. What you can do is break out of the loop as soon as you find what you're looking for to minimize computational time.

var found = false;
for(var i = 0; i < vendors.length; i++) {
    if (vendors[i].Name == 'Magenic') {
        found = true;
        break;
    }
}

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