Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----

// _________            .___      
// \_   ___ \  ____   __| _/____  
// /    \  \/ /  _ \ / __ |/ __ \ 
// \     \___(  <_> ) /_/ \  ___/ 
//  \______  /\____/\____ |\___  >
//         \/            \/    \/ 

/// Filter $list only keeping item for which $function call 
/// with $args as optional extra arguments returns a truthy value.
/// @author Hugo Giraudel
/// @param {List} $list - List to run function on
/// @param {String} $function - Name of function to run
/// @param {Arglist} $args - Optional extra arguments
/// @return {List}
@function filter($list, $function, $args...) {
  $u-list: ();
  
  @each $item in $list {
    @if call($function, $item, $args...) {
      $u-list: append($u-list, $item);
    }
  }
  
  @return $u-list;
}



// ________                         
// \______ \   ____   _____   ____  
//  |    |  \_/ __ \ /     \ /  _ \ 
//  |    `   \  ___/|  Y Y  (  <_> )
// /_______  /\___  >__|_|  /\____/ 
//         \/     \/      \/        

@function is-even($value) {
  @return $value % 2 == 0;
}

.foo {
  $list: (1, 2, 3, 4, 5);
  content: filter($list, 'is-even');
}

SassMeister-output.css

.foo {
  content: 2 4;
}