Taken with split string

var str1 = "123: 456: 789" ;
 var str2 = str1.split ( ":") [0 ]; 
Print str2; 
// output is 123

The wording is the wording javaScript, but in fact the wording of each language Datong trails, I use the flutter in

Explain the string str1, there is a colon between each of the three numbers, in str2, if we do not [0], it will output [123,456,789] of an array, the resulting output is above 123, because we only the output value of str2 labeled 0, is 123.

If these java C # language to write such a

Str1 = String "123: 456: 789" ; 
String [] str2 = str1.split ( ":") [0 ]; 
of System.out.print (str2); // Java output
 // Conlose.write (str2) ; // C # so the output should be, do not too long, not remember
 // output is 123