Medium Operators

Expand with FlatMap

Create a Flux emitting "Hello", "World". Use flatMap to split each word into individual characters (as separate emissions). Subscribe and print each character.

flatMap() transforms each element into a Publisher, then merges the inner publishers into a single Flux.

Expected

H
e
l
l
o
W
o
r
l
d

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Main.kt

Expand with FlatMap

medium⏱ 15 minkotlinreactorchallengeoperators

Create a Flux emitting "Hello", "World". Use flatMap to split each word into individual characters (as separate emissions). Subscribe and print each character.

flatMap() transforms each element into a Publisher, then merges the inner publishers into a single Flux.

Why this works

flatMap() transforms each element into a Publisher and then merges them. Here each string becomes a Flux of its characters via Flux.fromIterable().

Expected output

H
e
l
l
o
W
o
r
l
d

Expand with FlatMap

Create a Flux emitting "Hello", "World". Use flatMap to split each word into individual characters (as separate emissions). Subscribe and print each character.

flatMap() transforms each element into a Publisher, then merges the inner publishers into a single Flux.

Expected

H e l l o W o r l d

Expand with FlatMap

medium⏱ 15 minkotlinreactorchallengeoperators

Create a Flux emitting "Hello", "World". Use flatMap to split each word into individual characters (as separate emissions). Subscribe and print each character.

flatMap() transforms each element into a Publisher, then merges the inner publishers into a single Flux.

Why this works

flatMap() transforms each element into a Publisher and then merges them. Here each string becomes a Flux of its characters via Flux.fromIterable().

Expected output

H e l l o W o r l d