重复调用 Getter 方法与存储返回值

Question

我找不到任何关于此的信息，所以如果我问的问题已经得到回答，我深表歉意。

在编程方面，一般来说，在同一个函数中多次调用 getter 方法以达到预期的结果会更好的性能，还是应该调用一次 getter 并存储值回来了？

例如，如果我有这种方法进行二分查找：

   n ← size of the array
   x ← value to be searched

   Set lowerBound = 1
   Set upperBound = n 

   while true
      if upperBound < lowerBound 
         EXIT: x does not exists.
   
      set midPoint = lowerBound + ( upperBound - lowerBound ) / 2
      
      if getArray()[midPoint] < x
         set lowerBound = midPoint + 1
         
      if getArray()[midPoint] > x
         set upperBound = midPoint - 1 

      if getArray()[midPoint] = x 
         EXIT: x found at location midPoint
   end while

或者应该按如下方式存储数组：

   A ← getArray() 
   n ← size of the array
   x ← value to be searched

   Set lowerBound = 1
   Set upperBound = n 

   while true
      if upperBound < lowerBound 
         EXIT: x does not exists.
   
      set midPoint = lowerBound + ( upperBound - lowerBound ) / 2
      
      if A[midPoint] < x
         set lowerBound = midPoint + 1
         
      if A[midPoint] > x
         set upperBound = midPoint - 1 

      if A[midPoint] = x 
         EXIT: x found at location midPoint
   end while

提前致谢！

Code Adapted From TotorialsPoint