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functional programming (languages (scala (function (func(x: Int, y: =>…

- - - - func(x: Int, y: => Int)
        
        y will be called by name
      - generally call-by-value
      - composed of
        
        smaller functions
    - - call by name
        
        lazily evaluated
    - - call by value
        
        readily evaluated
    - - not required
      - required if multiple statements in one line
      - multiline expressions
        
        have operator in first line
        
        make it a block with parentheses
    - - func call self at end
      - optimize
        
        keyword
        
        tailrec
        
        throws error if func is not tailrec optimized
        
        dont use syntax like
        
        func(a) = if (z) q else b * func(c)
        
        use synax like
        
        func (a, accumulator) = if (z) q else func(c, accumulated)