Sometimes, there are several benchmarking questions arrived for example: A Lists faster than Vectors for what you're doing or are Vectors faster than Lists? How much memory can you save using unboxed Arrays to store primitives? When you do performance tricks such as pre-allocating arrays or using a while loop instead of a foreach call, how much does it really matter? var l: List or val b: mutable.Buffer? Memory usage can be estimated using different Scala benchmark codes, for example, refer to https://github.com/lihaoyi/scala-bench.

Table 6 here shows the estimated size (bytes) of the various immutable collections of 0-elements, 1- element, 4- elements, and powers of four all the way up to 1,048,576 elements. Although mostse are deterministic, these might be changed depending on your platform:

The following table shows the estimated size (bytes) of the array used in Scala with 0-elements, 1- element, 4- elements, and powers of four all the way up to 1,048,576 elements. Although mostse are deterministic, these might change depending on your platform:

However, this book does not set out to distinguish them in a broad way and hence we will omit any discussion on these topics. Refer to the following information box for further guidelines on these:

As we mentioned in Chapter 1, Introduction to Scala, Scala has a very rich Collection API. The same applies for Java but there are lots of differences between the two Collection APIs. In the next section, we will see some examples on Java interoperability.