| Article Index |
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| Syntax |
| Whole Program Syntax |
| All Pages |
The following article gives an overview of Scala syntax.
Important Rules Summary
- You can't have a field with the same name as a method.
- In class/object/trait, fields are automatically turned into accessor methods of the same name.
Function Syntax
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args are implicitly val; i.e. they are always read-only
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parameter types are always required
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return type is not always required as it can be inferred from expression result
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required for recursive functions
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required when using explicit return statement in the function body
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- braces {} are not needed for simple expressions
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no-arg function
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can be called with or without parenthesis () - as fn or fn()
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means call-by-name parameters look like variables
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a no-arg function that must be called without parenthesis ()
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makes object accessor (getter) methods look like object member variables
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this format seems to be used for compiler generated getters - i.e. you can't call obj.field()
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special syntax for procedure - it looks like a normal procedure call
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doesn't return a value (Unit) - fn has no = sign assigning it to a value
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procedures are considered to have side-effects and don't return values
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convention to use () when calling procedures - indicates to the user that there are side-effects
