Go around the loop's unsupported features

Comments

• eduard

  July 2020

  Hi Stephen,

  Couldn't you prepare the schedule offline before the experiment starts and then just load the loop table from a csv/excel file? I am not sure whether I understand the motivation behind your example script correctly, but from what I see in the example file you attached, this should be possible, by prespecifying which color/size combinations to show (and in which order).

  Alternatively you would have to work with list-like structures in javascript, and then carry this loop table through your experiment. If not terribly complicated, that could also be a viable solution.

  Eduard

  
• S_H

  July 2020

  Thank you very much for your answer Eduard!

  I'm very interested in the alternative that you suggested.

  The thing is that, as written here:

  "The JavaScript workspace is not persistent. That is, if you define a variable in one script, it will not be accessible in another script. Exceptions are the vars object and other variables that are globally available in JavaScript (e.g. window)."

  Will it be possible to create a "vars" list and to access a part of it in another code and then in a canvas?

  I will illustrate an example.

  In the beginning of the script to create the list:

   list = [
      { Color1: 'blue', Color2: 'green'},
      { Color1: 'green', Color2: 'yellow'},
      { Color1: 'yellow', Color2: 'red'}
  ];
  
  vars.list = shuffle(list) // shuffle function will be created sepereatly 
  

  and prior to the trial to do something like:

  Number = vars.count_Seq // In order to get a consecutive number
  
  vars.Color1Now = alert(vars.list[NUMBER].Color1); //define the trials first stimuli's color
  vars.Color2Now = alert(vars.list[NUMBER].Color2); //define the trials second stimuli's color
  

  and within the sketchpad to define the color "[Color1Now]"

  Will that work?
• eduard

  July 2020

  Hi Stephen,

  Generally, this should be possible. I don't know enough about js to check your syntax. Better just try it out yourself.

  Small note: Most shuffle functions don't return a shuffled object, but only None. So first shuffle, and once you shuffled assign the shuffled list to vars.list

  Good luck!

  Eduard

  
• S_H

  July 2020

  Thank you so much!
• Daniel

  July 2020

  Small note: Most shuffle functions don't return a shuffled object, but only None. So first shuffle, and once you shuffled assign the shuffled list to vars.list

  Actually, in Javascript there is no native shuffle function 😮. I usually revert to lodash for these functions that should have been in the standard library, but it is hard to use this library in osweb script items.

  Here are some examples of how to implement a shuffle function in pure javascript: https://medium.com/@nitinpatel_20236/how-to-shuffle-correctly-shuffle-an-array-in-javascript-15ea3f84bfb which you could copy-paste

  
• S_H

  August 2020

  Thanks Daniel!
• Daniel

  August 2020

  I also recently discovered pythonic, which brings a lot of common python functions to javascript with similar signatures.

  Also, have a read through https://dev.to/massa142/javascript-is-almost-pythonic-3f8 to see how python and javascript have become very similar.