**Result:** The square root of 4 is 2. We see 2.0 because Math.sqrt returns a double.

**Tip:** For cases when we do not need fractional values, we can cast the result of Math.sqrt to an int.

**Version 1:** In this version of the code we call Math.sqrt repeatedly—no caching is used here.

**Version 2:** We use a double array cache of 100 Math.sqrt values. We access those values many times.

**Result:** Accessing array elements is more than ten times faster than calling Math.sqrt each time.

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