How to Find the SCSS Index of the element in the list?

Question

Iam working on SCSS Loops and got stuck with a problem. The Problem is consider a list of colors.

$colors:'red','green','red','blue';

@each $color in $colors{
  $i:index($colors,$color);
  .cube:nth-child(#{$i}){
    background:$color;
  };
}

The Output of the above program is

.cube:nth-child(1) {
  background: "red";
}

.cube:nth-child(2) {
  background: "green";
}

.cube:nth-child(1) { // issue here unable to get index value 3
  background: "red"; 
}

.cube:nth-child(4) {
  background: "blue";
}

I am unable to get the index value 3. Can Someone help me to solve this issue. My question is

1. how to get the index value of 3?
2. Is it possible to get the index using each? if "YES" how?
3. If not what's the alternative way?

Answer 1

This is what you need:

$colors:'red','green','red','blue';

@for $i from 1 through length($colors) {
  $color: nth($colors, $i);
  .cube:nth-child(#{$i}){
    background:$color;
  };
}

Your's fails cause index($colors,$color) will return always the first position of the element: Read ->http://sass-lang.com/documentation/Sass/Script/Functions.html#index-instance_method