我可以为对象的方法/属性选择器设置正则表达式吗？ [英] can I set a regexp for an object's method/property selector?

问题描述

var regxp = /[\S]/; //any char, not sure if it's /.*/ or something else
var obj = {
 atr1: "bla"
}
var blahs = obj[regxp]; //returns atr1

我正在寻找从对象获取方法/属性名称的快捷方式，因为 for..in 与for循环相比较慢。
当我知道对象只有一个方法/属性时我想要这个特例

I'm looking for a shortcut to get methods/properties names from an object, because for..in is slow compared to a for loop for instance. I want this for a special case when I know the object will have only one method/property

推荐答案

是，您可以尝试使用正则表达式访问对象的属性，但否，它将无法执行您想要的操作：它会将正则表达式转换为字符串并使用该属性名称。

Yes, you can try to access a property of an object using a regular expression but no, it won't do what you want: it will convert the regex into a string and use that property name.

通过匹配正则表达式在对象上查找属性名称的唯一方法是 for ... in 循环，就像你提到的那样。如果对象只有一个属性，性能应该不是问题。

The only way to find a property name on an object by matching a regular expression is a for ... in loop, like you mentioned. The performance should not be an issue if the object has only one property.

function findPropertyNameByRegex(o, r) {
  for (var key in o) {
    if (key.match(r)) {
      return key;
    }
  }
  return undefined;
};
findPropertyNameByRegex(obj, regxp); // => 'atr1'

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