JS table of types plus types

Different result types of + by operand types

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            | undefined | boolean | number | string | function | object | null   | array  | 
-------------------------------------------------------------------------------------------

undefined   | number    | number  | number | string | string   | string | number | string | 

boolean     | number    | number  | number | string | string   | string | number | string | 

number      | number    | number  | number | string | string   | string | number | string | 

string      | string    | string  | string | string | string   | string | string | string | 

function    | string    | string  | string | string | string   | string | string | string | 

object      | string    | string  | string | string | string   | string | string | string | 

null        | number    | number  | number | string | string   | string | number | string | 

array       | string    | string  | string | string | string   | string | string | string | 

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Scss in WebStorm

в консоле:

gem install scss 

или
gem install sass


в WebStorm:

*.scss in css/*.css

--no-cache --update $FileName$:../css/$FileNameWithoutExtension$.css