change function name to match method name

[performantdata]

Change the lambda's name to match that of the corresponding method name (double) in the subsequent example.

[Philippus]

I think doubles is the correct name, as you get doubles after the map has executed.
Maybe further down this line val doubles = nums.filter(underFive).map(double) could change to val doublesUnderFive = nums.filter(underFive).map(double).

[performantdata]

@Philippus I think double is correct, as a verb that names the action that the function performs. But I don't disagree with this:

val doubles = nums.filter(underFive).map(double) could change to val doublesUnderFive = nums.filter(underFive).map(double).

Go with that if you want.

double also appears as the function name further down the page.

[bishabosha]

this change (aesthetic choice) does not bring value. perhaps find a grammar/spelling/syntax mistake