Dart Programming - String

void main() { 
   String str1 =  this is a single pne string ; 
   String str2 = "this is a single pne string"; 
   String str3 =    this is a multipne pne string   ; 
   String str4 = """this is a multipne pne string"""; 
   
   print(str1);
   print(str2); 
   print(str3); 
   print(str4); 
}

It will produce the following Output −

this is a single pne string 
this is a single pne string 
this is a multipne pne string 
this is a multipne pne string 

Strings are immutable. However, strings can be subjected to various operations and the resultant string can be a stored as a new value.

String Interpolation

The process of creating a new string by appending a value to a static string is termed as concatenation or interpolation. In other words, it is the process of adding a string to another string.

The operator plus (+) is a commonly used mechanism to concatenate / interpolate strings.

Example 1

void main() { 
   String str1 = "hello"; 
   String str2 = "world"; 
   String res = str1+str2; 
   
   print("The concatenated string : ${res}"); 
}

The concatenated string : Helloworld

void main() { 
   int n=1+1; 
   
   String str1 = "The sum of 1 and 1 is ${n}"; 
   print(str1); 
   
   String str2 = "The sum of 2 and 2 is ${2+2}"; 
   print(str2); 
}

The sum of 1 and 1 is 2 
The sum of 2 and 2 is 4