Support reduction about sassylists HOT 4 OPEN

You might want to have a look at this: http://sassmeister.com/gist/c36be3440dc2b5ae9ba2.

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I think it's not quite the same. The walk()-function resembles the typical "map" collection processing pattern. The difference to reduce() would be that the items in a list are reduced to a single value.

Applications include calculating the sum/product/... of elements or if the items are strings concat them.

For a complete set of lambda style collection processing functions a filter() method could also come in handy sometimes.

Btw.: I love your Blog!

from sassylists.

I'll have a closer look at this.

from sassylists.

I would probably implement it like this:

@function reduce($list, $function, $base, $args...) {
  @if not function-exists($function) {
    @error "Cannot find callback `#{$callback}`.";
  }

  @each $item in $list {
    $base: call($function, $base, $item, $args...);
  }

  @return $base;
}


@function add($a, $b, $args...) {
  $result: $a + $b;

  @if length($args) == 0 {
    @return $result;
  }

  @each $arg in $args {
    $result: $result + $arg;
  }

  @return $result;
}


test {
  a: reduce(a b c d e, add, "");
  b: reduce(1 2 3 4 5, add, 0);
  c: reduce(red green blue, mix, red);
}

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