What are variables in Flutter?

The basic building block of information in your Dart program will be variables. Anytime you’re working with data in an app, you can store that data in variables. For example, if you’re building a chat application, you can use variables to refer to chat messages or a user. Variables store references to these values.

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What is operator Dart?

An operator is a symbol that is used to manipulating the values or performs operations on its operand . The given expression: 5+4, in this expression, 5 and 4 are operands and “+” is the operator. Dart provides an extensive set of built-in operators to accomplish various types of operations.

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