Create collection of classes from arrays

$alpha_color: red; 
$bravo_color: blue; 
$charlie_color: green;

$color_names: alpha_color bravo_color charlie_color;
$color_vars: $alpha_color $bravo_color $charlie_color;
 
@each $name in $color_names {
  $i: index($color_names, $name);
  %#{$name} {
    background: nth($color_vars, $i);
  }
}
 
@each $name in $color_names {
  $i: index($color_names, $name);
  .#{$name} {
    @extend %#{nth($color_names, $i)};
  }
}

// Refactor with @for loop
@for $i from 1 through length($color_names) {
  %#{nth($color_names, $i)} {
    color: nth($color_vars, $i);
  }
}

@for $i from 1 through length($color_names) {
  .#{nth($color_names, $i)} {
    @extend %#{nth($color_names, $i)};
  }
}

// result
//.alpha_color {
//  background: red;
//}
//.bravo_color {
//  background: blue;
//}
//.charlie_color {
//  background: green;
//}
//.alpha_color {
//  color: red;
//}
//.bravo_color {
//  color: blue;
//}
//.charlie_color {
//  color: green;
//}