September 2015
Intermediate to advanced
250 pages
6h 40m
English
Content preview from Pragmatic Scala
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Parameter Routing
Where it makes sense, you can make function values more concise than you’ve seen so far. Let’s first create an example to find the maximum of an array of values, using the Math.max method to compare two values:
| | val largest = |
| | (Integer.MIN_VALUE /: arr) { (carry, elem) => Math.max(carry, elem)} |
In the function value, we’re sending the parameters carry and elem as arguments to the method max to determine which of those two is larger. We use the result of that computation to eventually determine the largest element in the array. As you learned in the previous section, we can use _ to make the function value concise and eliminate the explicit parameters, like so:
| | val largest = (Integer.MIN_VALUE /: arr) { Math.max(_, ... |
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