The "for" Loop and iteration map in Kotlin

Article Directory
Scene
"For" loop
Iteration Map
Summary Scenario

What is the difference between the "for" loop and the iteration map in Kotlin and the one we know in Java, and what are the better representations? "for" Loop

Kotlin "for" Loop structure: for (I in a.. b
A represents the starting value, and B represents the end value ... Represents the interval. For example (i in 1..100)
Note: The interval is inclusive, which is 1 to 100 (contains 100)

Here's an integer iteration to play the Fizz-buzz game. Note the difference between Java and Kotlin notation

Java package
Javas;
public class Fizzbuzz {
    private static String fizzbuzz (int i) {
        if (i% = = 0) {
            return "Fizzbuzz";
        } else if (i% 5 = = 0) {
            return "Buzz";
        } else if (i% 3 = = 0) {
            return "Fizz";
        } else {
            return "" +i;
        }
    }
    public static void Main (string[] args) {for
        (int i = 1; i < 101; i++) {
            System.out.println (Fizzbuzz (i)); 
  }
    }
}

Kotlin Package
kotlins fun
fizzbuzz (i:int) = when{
        I% = = 0 "fizzbuzz"
        I% 5 = = 0 "Buzz"
        I% 3 = = 0 "Fizz"
        Else, "$i"
} fun

Main (args:array<string>) {
    for (i in 1..100) {//Zone Inter-Iteration
        println (Fizzbuzz (i))
    }
}

Iteration Map

Kotlin Iteration Map Structure: for ((A, b) in map)
A for the map key,b represents the map of Value,a and B is a variable, you can name it
.. Syntax can be used to create a character range. For example, C in ' A ' ... ' F ')

//java package javas; import java.util.Iterator; import Java.util.TreeMap;
    public class Iteratingovermaps {private static character[] chars = new character[]{' A ', ' B ', ' C ', ' D ', ' E ', ' F '};
    private static Treemap<character, string> binaryreqs = new Treemap<character, string> (); public static void Main (string[] args) {for (int i = 0; i < chars.length; i++) {String s = integer.t
            Obinarystring (Chars[i]);
        Binaryreqs.put (Chars[i], s);
        } iterator<character> Iterator = Binaryreqs.keyset (). Iterator ();
            while (Iterator.hasnext ()) {Character key = Iterator.next ();
            String s = binaryreqs.get (key);
        SYSTEM.OUT.PRINTLN (key + "=" + s); }
    }
}

Kotlin Package
kotlins

import java.util.* fun

Main (args:array<string>) {
    val binaryreps = Treemap<char, string> () for
    (c in ' A ' ... ' F ') {//create character interval
        val binary = integer.tobinarystring (C.toint ())  //Convert ASCII code to binary
        binaryreps[c] = binary//According to  Key is c to save binary to map
    } for
    ((letter, binary) in binaryreps) {//iteration map, assign key and value to variable
        println ("$letter = $binary ")
    }
}

Summary

Discover the advantages of Kotlin by comparison:
Use a wider range of (.. Syntax to create a character range)
The code is more concise and capable

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