Execute the break; in SCSS

Question

I have some code.

Pug:

div(data-counter="100")

SCSS:

$start: 100;
$end: 20;

div:before {
  content: attr(data-counter);
  animation: countdown 10s steps(1, start) forwards;
}

@keyframes countdown {
  @for $i from 1 through $start { 
    @if $i == 50 {
      100% {
        content: 'Stop';
      }
    } @else {
      #{$i}% {
        content: '#{($start - $i)}';
      }
    }
  } 
}

The problem is that the counter counts from 100 and when it reaches 50, the counter would stop - 100% {content: 'Stop'; } And the animation would end (now it continues 49% {content: '51';} 100% {content: 'Stop';} 51% {content: '49';}).

Question: Is there something like break; for scss like in js?

codepen

P.S: @break; does not work as desired.

PPS: Same question in Russian.

Answer 1

Based on the answer posted on the Russian question you can use SCSS to create the numbers

Demo: https://codepen.io/jakob-e/pen/mwYKpV

SCSS:

@function countdown-numbers($from: 100, $through: 0){
    $str: '';
    @for $i from $from through $through { $str: $str + '#{$i}\A'; }
    @return $str;
}


div {
    line-height: 1.2;
    height: 1.2em;
    overflow: hidden;
    &::after {
        display: inline-block;
        white-space: pre-wrap;
        // creates 50 numbers 100\A 99\A ... 51\A
        // and add STOP to the string 
        content: countdown-numbers(100, 51) + STOP;
        // run animation in 50 steps (don't count start) 
        animation: countdown 10s steps(50) forwards;       
    }
}
@keyframes countdown {
    to { transform: translateY(calc(1.2em - 100%)) }
}

CSS Output (using Autoprefixer):

div {
  line-height: 1.2;
  height: 1.2em;
  overflow: hidden;
}
div::after {
  display: inline-block;
  white-space: pre-wrap;
  content: "100\a 99\a 98\a 97\a 96\a 95\a 94\a 93\a 92\a 91\a 90\a 89\a 88\a 87\a 86\a 85\a 84\a 83\a 82\a 81\a 80\a 79\a 78\a 77\a 76\a 75\a 74\a 73\a 72\a 71\a 70\a 69\a 68\a 67\a 66\a 65\a 64\a 63\a 62\a 61\a 60\a 59\a 58\a 57\a 56\a 55\a 54\a 53\a 52\a 51\aSTOP";
 -webkit-animation: countdown 5s steps(50) forwards;
         animation: countdown 5s steps(50) forwards;
}

@-webkit-keyframes countdown {
  to {
    -webkit-transform: translateY(calc(1.2em - 100%));
            transform: translateY(calc(1.2em - 100%));
  }
}

@keyframes countdown {
  to {
    -webkit-transform: translateY(calc(1.2em - 100%));
            transform: translateY(calc(1.2em - 100%));
  }
}