if statement - Sass - Check which kind of value a variable has

Question

Suppose i have a variable:

$var: 5px;

but somewhere in code its value have changed in to possible color, number, em, rm etc.

Is there any function to detect which type of value it has?

i.e

@if is-color($var) { //do something }

I know there is no is-color function in sass but are there other methods to do this or function?

Answer 1

From the Sass documentation:

type_of($value)

Returns the type of a value.

Examples:

type-of(100px)  => number
type-of(asdf)   => string
type-of("asdf") => string
type-of(true)   => bool
type-of(#fff)   => color
type-of(blue)   => color

http://sass-lang.com/documentation/Sass/Script/Functions.html#type_of-instance_method

(note that - and _ is interchangeable in Sass functions).