```
$colors:(
bg:#eee,
text-color:#333,
primary:#ff2d51
);
@function color($key){
@if map-has-key($colors, $key){
@return map-get($colors, $key)
}
@warn "Unknown `#{$key}` in $colors.";
@return null
}
div{
background: color(bg)
}
p{
color:map-get($colors,text-color)
}
```
