as3比較兩個數組並返回索引

Question

我想創建一個函數來比較兩個數組並返回找到的項目的索引。如果我的例子數組是：

var distances:Array = new Array (0,275,217,385,275,0,251); 
var selectedDist:Array = new Array (217,275,251); 

我想它返回2,4,6

Answer 1

嘗試以下操作：

var indices:Array = []; 

for each(var distance:int in selectedDist) { 
    var index:int = distances.indexOf(distance); 
    if (index >= 0) { 
     indices.push(index); 
    } 
} 

return indices; 

Answer 2

假如你總是selectedDist陣列比較距離陣列，我會這樣做：

protected function compareArrays(arr1:Array, arr2:Array):Array 
{ 
    var matches:Array = new Array(); 

    for(var x:int=0; x < arr2.length; x++) { 
    /* 
    * indexOf returns -1 id the element is not found in the array 
    * http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/Array.html#indexOf() 
    * but you have to grab the lastIndexOf 275, as requested... 
    */ 
    if (arr1.indexOf(arr2[x] > -1)) 
     matches.push(arr1.lastIndexOf(arr2[x])); 
    } 

    return matches; 
}