Editing finding numbers - array search vs associative object

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Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

var count = 0; 
for (var i=0; i<arr.length; i++) { 
   var target = x-arr[i]; 
   if (target < 0) { continue; }
   if (arr2.indexOf(target) != -1) {
      count++;
	    continue; 
	} 
}

Test 2

Title

Async (check if this is an asynchronous test)

Code

var count=0; 
for (var i=0; i<arr.length; i++) { 
	arrObj[arr[i]]=arr[i]; 
}
for (var i=0; i<arr.length; i++) { 
	var target = x-arr[i]; 
  if (target < 0) { continue; }  //if arr is sorted, could break instead
	if (arrObj[target]) { 
      count++;
	    continue; 
	}
}