Wanna get the first character of the first two wor...

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[rajendhiraneasu]

Wanna get the first character of the first two words from the string, below is my code snippet can any one help to optimize it?

val lbl = {txt:String -> txt.toCharArray()[0].toString()}

val username = "Rajendra prasad guru" 
val initials = username.split(" ").let {
    val l = lbl(it[0])
    if(it.size>1) "$l${lbl(it[1])}" else l
}.toUpperCase()
println(initials)

Output is :RP

[Dominaezzz]

If you really want to optimize here, drop the functional programming style and use indexOf.

[rajendhiraneasu]

i'm about to use these in the multiple places, so wrote this lbl lambda expression in util. functional programming won't help us to do this optimized way so? @Dominaezzz

[christophsturm]

lbl can be written as txt.first().toString()

[christophsturm]

and your whole method could be

.splitToSequence(" ").map{it.first()}.take(2).joinToString("")

[Dominaezzz]

Might be slightly cheaper to put a limit on
that split.

[christophsturm]

ah true. but a sequence is lazy anyway

[Dominaezzz]

Laziness helps a bit but there's a difference between returning (the first two words and the rest of the string) and (the first word and the rest of the string)

[Dominaezzz]

Hmm, what if the string starts with a space.

[Dominaezzz]

Nvm, it's configurable.

[christophsturm]

hmm I’m not sure I undestand what you mean. from my understanding of sequences it does not matter much where the take(2) is

[christophsturm]

the splitting is lazy and will stop when the sequence stops

[rajendhiraneasu]

@Dominaezzz @christophsturm Thank you both for suggesting me

[Dominaezzz]

I'm saying use a limit of 1 instead of 2. Then you save having to pull out the second word from the rest of the string.

[christophsturm]

it does not work with limit 1

[christophsturm]

but limit = 2 is a good idea

[nkiesel]

how about
"Rajendra prasad guru".split(" ", limit=2).joinToString("") { it.take(1).toUpperCase() }