There are many cases of elegantly using reduce() with a different return type than the list's item type. Here is a JS function which computes the combined leng

There are many cases of elegantly using reduce() with a different return type than the list's item type. Here is a JS function which computes the combined length of all strings in a list: stringsLen = (strings) => strings.reduce((acc, item) => acc += item.length, 0); stringsLen(['hello', 'world']) //> 10 Sure, you can argue that this works, but it misses the point. stringsLen = (strings) => strings.map(s => s.length).reduce((acc, n) => acc += n, 0); stringsLen(['hello', 'world'])