refactor(var/functions): set $delimiter, $prefix, $suffix argum…

…ents to `null` in `var.css()` `var.get()` and `var.name()`.

var/functions/_var.css.function.scss

@@ -8,22 +8,22 @@
 @use 'var.name.function';
 
 // Status: DONE
-// The `var.css()` function returns the CSS variable of `$name`, `$fallback` value, `$delimiter`, `$prefix`, `$suffix` and translated with `$dictionary`.
+// The `var.css()` function returns the CSS variable of `$name`, `$fallback` value, `$delimiter`, `$prefix`, `$suffix` translated with `$dictionary`.
 // `$name` structure `--#{$prefix}#{$delimiter}#{$name}#{$delimiter}#{$suffix}`
 // @param `$name` The `string` or `list` to set the CSS variable name.
-// @param `$fallback` A fallback value.
+// @param `$fallback` A fallback value for returned CSS variable of `$name`.
 // @param `$dictionary` Dictionary to translate `$name`.
-// @param `$delimiter` Separator between each element of `$name`.
-// @param `$prefix` Prefix as the first word in `$name`.
-// @param `$suffix` Suffix as the last word in `$name`.
-// @return The return value is CSS variable.
+// @param `$delimiter` Separator between each element in name of returned CSS variable.
+// @param `$prefix` Prefix in `$name`. By default, it uses `prefix` of `$var` sass variable.
+// @param `$suffix` Suffix in `$name`. By default, it uses `suffix` of `$var` sass variable.
+// @returns The return value is CSS variable of `$name`.
 @function css(
   $name,
   $fallback: null,
   $dictionary: (),
-  $delimiter: map.get(variables.$var, delimiter),
-  $prefix: map.get(variables.$var, prefix),
-  $suffix: map.get(variables.$var, suffix),
+  $delimiter: null,
+  $prefix: null,
+  $suffix: null,
 ) {
   @return var(var.name(
     $name,

var/functions/_var.get.function.scss

@@ -15,24 +15,25 @@
 @use 'var.unit.function' as *;
 
 // Status: DONE
-// The `var.get()` function returns CSS variable .
-// @param `$name`
-// @param `$adjust`
-// @param `$unit`
-// @param `$fallback`
-// @param `$dictionary`
-// @param `$prefix`
-// @param `$suffix`
-// @return
+// The `var.get()` function returns CSS variable built from `$name`, `$delimiter`, `$prefix`, and `$suffix`.
+// @param `$name` The property name of `string` or `list` type.
+// @param `$adjust` Adjust the CSS variable `var()`.
+// @param `$unit` A `bool` (then default unit is taken), or unit type value to multiply returned CSS variable.
+// @param `$fallback` Fallback value if property `$name` does not exist.
+// @param `$dictionary` Dictionary to translate `$name`.
+// @param `$delimiter` Separator between each element in name of returned CSS variable.
+// @param `$prefix` Prefix in `$name`. By default, it uses `prefix` of `$var` sass variable.
+// @param `$suffix` Suffix in `$name`. By default, it uses `suffix` of `$var` sass variable.
+// @returns The return value is CSS variable of `$name`.
 @function get(
   $name,
   $adjust: null,
   $unit: false,
   $fallback: null,
   $dictionary: (),
-  $delimiter: map.get(var.$var, delimiter),
-  $prefix: map.get(var.$var, prefix),
-  $suffix: map.get(var.$var, suffix),
+  $delimiter: null,
+  $prefix: null,
+  $suffix: null,
 ) {
   @if type-of($name) == list and list.length($name) == 0 {
     @return (); // REVIEW: consider changing the solution

var/functions/_var.name.function.scss

@@ -9,20 +9,27 @@
 @use '../../list/get/get.map.function';
 
 // Status: DONE
-// The `var.name()` function .
-// @param `$name`
-// @param `$dictionary`
-// @param `$prefix`
-// @param `$suffix`
-// @return
+// https://developer.mozilla.org/en-US/docs/Web/CSS/var
+// The `var.name()` function returns custom property(CSS variable.
+// @param `$name` The `string` or `list` to set the CSS variable name.
+// @param `$delimiter` Separator between each element in name of returned CSS variable.
+// @param `$prefix` Prefix in `$name`. By default, it uses `prefix` of `$var` sass variable.
+// @param `$suffix` Suffix in `$name`. By default, it uses `suffix` of `$var` sass variable.
+// @returns The return value is CSS variable of `$name`.
 @function name(
   $name,
   $dictionary: (),
-  $delimiter: map.get(var.$var, delimiter),
-  $prefix: map.get(var.$var, prefix),
-  $suffix: map.get(var.$var, suffix)
+  $delimiter: null,
+  $prefix: null,
+  $suffix: null
 ) {
-  @return --#{functions.name($name, $dictionary, $delimiter, $prefix, $suffix)};
+  @return --#{functions.name(
+    $name,
+    $dictionary,
+    $delimiter or map.get(var.$var, delimiter),
+    $prefix or map.get(var.$var, prefix),
+    $suffix or map.get(var.$var, suffix)
+  )};
 }
 
 // Examples.