• Adobe After Effects Expressions

  Compare Arrays in Extendscript

  Posted by Rodrigo Aben on October 12, 2022 at 4:49 am

  How do I check if an array contains values of another array?

  Lets say I have:

  myLayers: [1,12];

  containingLayers: [1,2,3,4,5];

  How do I check is the second array contains both values of the first one?

  Rodrigo Aben replied 3 years, 7 months ago 3 Members · 5 Replies
• 5 Replies

• 

  Dan Ebberts

  October 12, 2022 at 5:26 am

  If you’re using the JavaScript engine, something like this should work:

  myLayers = [1,12];
  containingLayers = [1,2,3,4,5];
  success = true;
  for (var i = 0; i < myLayers.length; i++){
    if (! containingLayers.includes(myLayers[i])){
      success = false;
      break;
    }
  }
  success
• 

  Rodrigo Aben

  October 15, 2022 at 3:51 am

  Function .includes does not exist on extendscript
• 

  Dan Ebberts

  October 15, 2022 at 6:34 am

  I’m guessing you either have File > Project Settings > Expressions > Expression Engine set to Legacy Extendscript (instead of JavaScript) or you’re running an old version of AE
• 

  Filip Vandueren

  October 15, 2022 at 7:05 am

  If you need it in scripting, it’s easier to implement with indexOf(). This is also not in Extendscript, but it is a bit easier to ‘polyfill’:

  if (!Array.prototype.indexOf) {
      Array.prototype.indexOf = function(obj, start) {
          for (var i = (start || 0), j = this.length; i < j; i++) {
              if (this[i] === obj) { return i; }
          }
          return -1;
      }
  }
  
  myLayers = [1,12];
  containingLayers = [1,2,3,4,5];
  success = true;
  for (var i = 0; i < myLayers.length; i++){
    if (containingLayers.indexOf(myLayers[i])==-1) {
      success = false;
      break;
    }
  }
  succes;

  (Haven’t tested this)
• 

  Rodrigo Aben

  October 16, 2022 at 1:21 am

  That solved beautifully, Filip. Thanks a lot!

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