Sass Introspection Functions
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 |
