Gets the alpha (transparency) value of a color.
alpha() extracts the alpha value from a p5.Color object, an array of color components, or a CSS color string.
Examples
Syntax
  
      alpha(color)
      
         
      
    
Parameters
color
p5.Color|Number[]|String: 
p5.Color object, array of color components, or CSS color string.
Returns
Number: the alpha value.
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