SCALA

how loop in scala

for ((name, count) <- names.zipWithIndex) {
    println(s"$count is $name")
}

how loop in scala

for (i <- 1 to 3) println(i)

how loop in scala

for {
    i <- 1 to 10
    if i < 4
} println(i)

how loop in scala

for {
    i <- 1 to 10
    if i > 3
    if i < 6
    if i % 2 == 0
} println(i)

how loop in scala

for (i <- 0 until names.length) {
    println(s"$i is ${names(i)}")
}

how loop in scala

for (i <- 1 to 10 if i < 4) println(i)

how loop in scala

val out = for (e <- names) yield e.capitalize
val out = names.map(_.capitalize)

how loop in scala

val ratings = Map(
    "Lady in the Water"-> 3.0, 
    "Snakes on a Plane"-> 4.0, 
    "You, Me and Dupree"-> 3.5
)

for ((name,rating) <- ratings) println(s"Movie: $name, Rating: $rating")

how loop in scala

val nameMap = Map("firstName" -> "Ed", "lastName" -> "Chigliak")
for ((k,v) <- nameMap) {
    println(s"key: $k, value: $v")
}

val result = for ((k,v) <- nameMap) yield {
    s"key: $k, value: $v"
}
println(result)

how loop in scala

names.zipWithIndex.foreach { d =>
    println(s"${d._2} is ${d._1}")
}

how loop in scala

for ((name,count) <- names.view.zip(Stream from 1)) {
    println(s"$count is $name")
}

how loop in scala

res: Seq[(Int, Char)] = List((1,a), (1,b), (1,c), 
                             (2,a), (2,b), (2,c),
                             (3,a), (3,b), (3,c))

how loop in scala

val lengths = for (e <- names) yield {
    // imagine that this required multiple lines of code
    e.length
}

how loop in scala

val names2 = for (e <- names) yield e.capitalize

how loop in scala

val nums = Seq(1,2,3)
val letters = Seq('a', 'b', 'c')
val res = for {
    n <- nums
    c <- letters
} yield (n, c)

how loop in scala

for (n <- names) println(n)
for (n <- names) println(n.capitalize)    
for (n <- names) {
    // imagine this requires several lines
    println(n.capitalize)
}

how loop in scala

val names = Seq("chris", "ed", "maurice")
val nums = Seq(1, 2, 3)

how loop in scala

ratings.foreach {
    case(movie, rating) => println(s"key: $movie, value: $rating")
}

ratings.foreach(x => println(s"key: ${x._1}, value: ${x._2}"))
ratings.keys.foreach((movie) => println(movie))
ratings.keys.foreach(println)
ratings.values.foreach((rating) => println(rating))