jinf Fei
Posts: 3
Nickname: jm8371
Registered: Mar, 2018
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Re: Doubt in Scala Program
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Posted: Mar 15, 2018 11:52 PM
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import scala.io.Source
def widthOfLength(s: String) = s.length.toString.length
if (args.length > 0) {
// read all line from file to list.
val lines = Source.fromFile(args(0)).getLines().toList
// reduceLeft function
// all line at list (a1, a2, a3, a4, a5, ....)
// c = a1.length max a2.length
// c = c.length max a3.length
// c = c.length max a4.length
// c = c.length max a5.length
// ...
// return c
val longestLine = lines.reduceLeft(
(a, b) => if (a.length > b.length) a else b
)
val maxWidth = widthOfLength( longestLine )
for (line <- lines) {
// calculate we need space, for example:
// line1: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
// line2: | space |xxxxxxxxxxxxxxx
//
val numSpaces = maxWidth - widthOfLength(line)
// space char
val padding = " " * numSpaces
println(padding + line.length +"|"+ line)
}
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