In Dart, you can compare two strings using the == operator. This operator returns true if both strings have the same sequence of characters, otherwise it returns false. Here are some examples:
void main() {
String str1 = "Hello";
String str2 = "hello";
String str3 = "Hello";
// Case sensitive comparison using ==
print(str1 == str2); // false
print(str1 == str3); // true
// Case insensitive comparison
print(str1.toLowerCase() == str2.toLowerCase()); // true
// Compare using compareTo method
print(str1.compareTo(str2)); // positive value
print(str1.compareTo(str3)); // 0
print(str2.compareTo(str3)); // negative value
}
In the first example, we compare
str1 with str2. Since they have different cases, the result is false. In the second example, we compare str1 with str3, which has the same sequence of characters but a different reference, the result is true.
To perform a case insensitive comparison, we can convert both strings to lowercase using the toLowerCase() method and then use the == operator to compare them.
Finally, we can use the compareTo() method to compare two strings. This method compares the lexicographic (dictionary) order of two strings and returns a negative integer if the first string comes before the second string, a positive integer if it comes after, and 0 if they are equal.