Sass Introspection Functions

The introspection functions are rarely used when building a stylesheet. However, they are valuable if something does not work properly - to figure out what's going on: like debugging functions.

The following table lists all introspection functions in Sass:

Function	Description & Example
call(function, arguments...)	Calls a function with arguments, and returns the result.
content-exists()	Checks whether the current mixin was passed a @content block.
feature-exists(feature)	Checks whether feature is supported by the current Sass implementation. Example: feature-exists("at-error"); Result: true
function-exists(functionname)	Checks whether the specified function exists. Example: function-exists("nonsense") Result: false
get-function(functionname, css: false)	Returns the specified function. If css is true, it returns a plain CSS function instead.
global-variable-exists(variablename)	Checks whether the specified global variable exists. Example: variable-exists(a) Result: true
inspect(value)	Returns a string representation of value.
mixin-exists(mixinname)	Checks whether the specified mixin exists. Example: mixin-exists("important-text") Result: true
type-of(value)	Returns the type of value. Can be number, string, color, list, map, bool, null, function, arglist. Example: type-of(15px) Result: number type-of(#ff0000) Result: color
unit(number)	Returns the unit associated with a number. Example: unit(15px) Result: px
unitless(number)	Checks whether the specified number has a unit associated with it. Example: unitless(15px) Result: false unitless(15) Result: true
variable-exists(variablename)	Checks whether the specified variable exists in the current scope. Example: variable-exists(b) Result: true

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