• Anonymous Function: Any function, usually without name, residing in a variable, passed into another function or returned from a function.
• Function: A sequence of program statements that perform a specific task, packaged as a unit. The function can be called or invoked elsewhere in the program. Functions can be passed arguments or parameters and can return values.
• Concatenation: + To join string values together, creating a new string value from the resulting operation. Concatenation occurs when one or more of the + operator's operands are strings.
• Operands: The values provided to operators to be operated upon.
• Operator: A symbol that will perform some kind of operation (calculation, comparison) on one or more values called operands.