数组唯一值 [英] Array unique values

问题描述

在处理从YQL返回的JSON时，我发现自己正在寻找一种从数组中提取所有唯一值的方法.

While dealing with JSON returned from YQL, I found myself looking for a way extract all unique values from an array.

function uniqueArrayValues(o){
      var items = o.query.results.row,
          output = [];

  function check(val){
    for(var c=0; c<output.length; c++){
      if(output[c] === val){
        return false;
        }
    }
     return true;
  }

 for(var i=1; i<items.length; i++){
   if(check(items[i].team)){
     output.push(items[i].team);
    }    
  }

  return output;
}

代码看起来有点忙"，我想知道是否有更优雅的方法从数组中提取唯一值.

The code looks a bit too 'busy' and i was wondering if there is a more elegant way of extracting unique values from an array.

推荐答案

您可以使用indexOf来检查元素是否在数组中.

You can use indexOf to check if an element is in an array.

 function check(val){
        return output.indexOf(val) != -1;
    }

，或者如果您具有唯一的ID或名称，则使用对象而不是数组: var output = {}

or use an object instead of an array if you have an unique id or name: var output = {}

for(var i=1; i<items.length; i++){
   if(!output[items[i].team.id])){
     output [items[i].team.id] = items[i].team;
    }    
  }

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