STstickfigure·Jan 19, 2022Recommendation phrase
Here's a Java example that sums the populations of a list of Countries:
int population = countries.stream().mapToInt(Country::getPopulation).sum();
The Go implementation:
var population = 0
for _, country := range countries {
population += country.Population
}
It gets more perverse if you need to flatMap, or transmute components of map types, etc. If you want even more power, take a look at https://github.com/amaembo/streamex. This sort of container manipulation is bread and butter for business processing. I use it every day, sometimes with a dozen operations. This (with liberal use of `final` values) makes for some pretty functional-looking code.
I'll grant you the Kotlin or Scala version is slightly more compact. But not fundamentally different, like the Go version.
I (and the pretty much every language designe
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r in the post-Java era) disagree with you about checked exceptions, but that's a whole different thread...