The isEmpty property checks if the string is empty. The isNotEmpty property, on the other hand, checks if the string is not empty.
string.isNotEmpty
string.isEmpty
The isNotEmpty property returns true if the string is not empty. Otherwise, false is returned.
The isEmpty property returns true if the string is empty. Otherwise, false is returned.
The code below demonstrates how to check whether or not the string is empty.
void main() {// create a empty stringvar str = "";print('The string is - $str.');// check if the string is not emptyprint("str.isNotEmpty : ${str.isNotEmpty}");// check if the string is emptyprint("str.isEmpty : ${str.isEmpty}");str = "hi";print('\nThe string is - $str.');// check if the string is not emptyprint("str.isNotEmpty : ${str.isNotEmpty}");// check if the string is emptyprint("str.isEmpty : ${str.isEmpty}");}
Line 3: We create a variable named str and assign an empty string as a value.
Line 7: We use the isNotEmpty property to check if str is not empty. In our case, str is empty, so false is returned.
Line 10: We use the isEmpty property to check if str is empty. In our case, the str is empty, so true is returned.
Line 12: We change the value of the str variable to the "hi" string.
Line 15: We use the isNotEmpty property to check if str is not empty. In our case, str is not empty, so true is returned.
Line 17: We use the isEmpty property to check if str is empty. In our case, the str is not empty, so false is returned.