pyp 20/21 sem 1

[nanfang02]

cs2030(s) ay2020/21 qn6 streams:
Hiii im not very sure on how to do qn 6 (e).... please help thank you!

[pohja1999]

hmm can u try this. [.reduce(0, (a,b) -> a + b.length(), (a,b) -> a + b);] not sure if this is what the question is asking for. Or, you can do this .reduce("", (a,b) -> a + b).length(); i think both works.

[jingyulim1]

I think this question is testing Stream's 2 arguments reduce in (d) and 3 arguments reduce in (e).

For (e), since we have to reduce directly from a stream of String and return int, the only reduce we can use is the 3 arguments reduce.

This is due to the difference in the seed/identity type, where for the reduce with 2 arguments the seed/identity must be the same type as the stream but not for the reduce with 3 arguments.

[Swagston20]

Use either reduce(0, (x,y) -> x + y.length(), (x,y) -> x + y); or .reduce("", (x,y) -> x + y).length()

[Lu-Yi-Fan]

Personally i defined it as int count(List words) {
return words.stream()
.reduce("", (x, y) -> x + y)
.length();
}

[summerthia02]

I used this: words.stream().reduce(0, (x,y) -> x + y.length(), (x,y) -> x+ y)

[nanfang02]

thank you guysss :> all the best for finals !!

[calvinseptyanto]

int count(List words) {
return words.stream()
.reduce(0, (x,y) -> x+y.length(), (x,y) -> x+y);
}

[Zhenyubbx]

int count(List words) {
return words.stream().reduce(0, (x,y)-> x + y.length(), (x, y) -> x +y);
}