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CSS Sass Basics (retired) Advanced Sass Concepts Interpolation and if/else Loops

Posted by cameroneckelberry2
cameroneckelberry2
8,701 Points

Need a little help Clarifying Interpolation

So, I get how to do it, but I don't really get what is going on.

For example: 

@for $i from 1 through 100 {
    .box:nth-child(#{$i}) {
        background: darken(white, $i);
    }
}

@each $member in thom, jonny, colin, phil {
    .bandmember.#{$member} {
        background: url("images/#{$member}.jpg");
    }
}

On the Sass for background: darken, I don't use interpolation and it doesn't compile an error, but if I do use it, it complies an error. But on background: url I don't use interpolation and it spits out background: url("images/$member.jpg"); in the CSS file.

Can anyone help clarify the mechanics of this?