Functions

Functions are objects and have a type, Function.

Functions can be assigned to variables or passed as arguments to other functions. 

bool isNoble(int atomicNumber) { 
   return _nobleGases[atomicNumber] != null; 
}
isNoble(atomicNumber) { 
   return _nobleGases[atomicNumber] != null;
}
The function still works if you omit the types. 
bool isNoble(int atomicNumber) => _nobleGases[atomicNumber] != null;
For functions that contain just one expression, you can use a shorthand syntax.
The => expr syntax is a shorthand for { return expr; }. The => notation is sometimes referred to as arrow syntax.

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