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Scala – Lists

March 3, 2018 admin 0

// Scala - Lists 
object Demo {
  val mylist: List[Int] = List(1,2,5,8,9,6,4);
  val names: List[String] = List("Max", "Tom", "John");
	def main(args: Array[String]) {
		println(0 :: mylist);  
		println(mylist);  
		println(names);  
		println(1 :: 5:: 9 :: Nil); 
		println(mylist.head);  
		println(names.tail);   
		println(mylist.tail);   
		println(names.isEmpty);   
		println(mylist.reverse);  
		println(List.fill(5)(2)); 		
		println(mylist.max);  
		
		mylist.foreach( println )
		var sum : Int = 0;
		mylist.foreach(sum += _);
		println(sum);
		
		for (name <- names) {
		  println(name);
		}
		 
		println(names(0));
   
	}
}

/*
OUTPUT:
List(0, 1, 2, 5, 8, 9, 6, 4)
List(1, 2, 5, 8, 9, 6, 4)
List(Max, Tom, John)
List(1, 5, 9)
1
List(Tom, John)
List(2, 5, 8, 9, 6, 4)
false
List(4, 6, 9, 8, 5, 2, 1)
List(2, 2, 2, 2, 2)
9
1
2
5
8
9
6
4
35
Max
Tom
John
Max


*/

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// Scala - Lists

object Demo {

val mylist: List[Int] = List(1,2,5,8,9,6,4);

val names: List[String] = List("Max", "Tom", "John");

def main(args: Array[String]) {

println(0 :: mylist);

println(mylist);

println(names);

println(1 :: 5:: 9 :: Nil);

println(mylist.head);

println(names.tail);

println(mylist.tail);

println(names.isEmpty);

println(mylist.reverse);

println(List.fill(5)(2));

println(mylist.max);

mylist.foreach( println )

var sum : Int = 0;

mylist.foreach(sum += _);

println(sum);

for (name <- names) {

println(name);

}

println(names(0));

}

/*

OUTPUT:

List(0, 1, 2, 5, 8, 9, 6, 4)

List(1, 2, 5, 8, 9, 6, 4)

List(Max, Tom, John)

List(1, 5, 9)

1

List(Tom, John)

List(2, 5, 8, 9, 6, 4)

false

List(4, 6, 9, 8, 5, 2, 1)

List(2, 2, 2, 2, 2)

9

1

2

5

8

9

6

4

35

Max

Tom

John

Max

*/

Scala – Arrays

February 19, 2018 admin 0

// Scala - Arrays 
import Array._

object Demo {
	val myarray: Array[Int] = new Array[Int](4);
val myarray2 = new Array[Boolean](5);
val myarray3 = Array(1,2,3,4,5,6,8);
def main(args: Array[String]) {
	myarray(0) = 20;
	myarray(1) = 50;
	myarray(2) = 10;
	myarray(3) = 30;
	println(myarray3.length);  
	val result = concat(myarray, myarray3);
	
	for (x <- result) {
		println(x);
	}

	for (i <- 0 to (myarray.length - 1)) {
		println(myarray(i));    
	}
}
}

/*
OUTPUT:
7
20
50
10
30
1
2
3
4
5
6
8
20
50
10
30


*/

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// Scala - Arrays

import Array._

object Demo {

val myarray: Array[Int] = new Array[Int](4);

val myarray2 = new Array[Boolean](5);

val myarray3 = Array(1,2,3,4,5,6,8);

def main(args: Array[String]) {

myarray(0) = 20;

myarray(1) = 50;

myarray(2) = 10;

myarray(3) = 30;

println(myarray3.length);

val result = concat(myarray, myarray3);

for (x <- result) {

println(x);

}

for (i <- 0 to (myarray.length - 1)) {

println(myarray(i));

}

/*

OUTPUT:

7

20

50

10

30

1

2

3

4

5

6

8

20

50

10

30

*/

Scala String Example

February 8, 2018 admin 0

// Scala - String 
object Demo {
  val num1 = 75;
  val num2 = 100.25;
  val str1 : String = "Hello World";
  val str2 : String = " Max";
  def main(args: Array[String]) {
    println(str1.length());  
    println(str1.concat(str2));
    println(str1 + str2);
    
    val result = printf("(%d -- %f -- %s)", num1, num2, str1);
    println(result);
    println("(%d -- %f -- %s)".format(num1, num2, str1));
    printf("(%d -- %f -- %s)", num1, num2, str1);
  }
}

/*
OUTPUT:
11
Hello World Max
Hello World Max
(75 -- 100.250000 -- Hello World)()
(75 -- 100.250000 -- Hello World)
(75 -- 100.250000 -- Hello World)
*/

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// Scala - String

object Demo {

val num1 = 75;

val num2 = 100.25;

val str1 : String = "Hello World";

val str2 : String = " Max";

def main(args: Array[String]) {

println(str1.length());

println(str1.concat(str2));

println(str1 + str2);

val result = printf("(%d -- %f -- %s)", num1, num2, str1);

println(result);

println("(%d -- %f -- %s)".format(num1, num2, str1));

printf("(%d -- %f -- %s)", num1, num2, str1);

}

/*

OUTPUT:

11

Hello World Max

(75 -- 100.250000 -- Hello World)()

(75 -- 100.250000 -- Hello World)

*/

How to install MongoDB on Mac OS X

January 7, 2018 admin 1

In this post we will see How to install MongoDB on Mac OS X. MongoDB is one of the most used, […]

Function Currying in Scala

January 6, 2018 admin 0

Currying is the technique of transforming a function that takes multiple arguments into a function that takes a single argument. […]

Scala – Closures

January 6, 2018 admin 0

A closure is a function which uses one or more variables declared outside this function.

// Scala - Closures
/* codebind.com */
import java.util.Date
object Demo {
  val number = 10;
  val add = (x : Int) =>  {
    x + number;
  }
  
  def main(args: Array[String]) {
    println(add(20));
    println(number)
  }
}

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