TypeError: Cannot find function includes in object (even though the object is an array)

Question

Why does app scripts not find the function includes in the object that is clearly an Array.

function test() {
  var list = ['a', 'b', 'c'];
  Logger.log(list.constructor.name) // Array
    if ( list.includes('a') ){
      Logger.log('yes');
    } 
 return 'done';
}

The error text:

TypeError: Cannot find function includes in object a,b,c. (line 134, file "Code")

I am new with google app scripts and I am getting mad. I have tried it in a online Javascript console and everything is fine.

Answer 1

Due to the comment that helped, this is an alternative solution.

function test() {
  var list = ['a', 'b', 'c'];
  Logger.log(list.constructor.name) // Array
  if ( list.indexOf('a') > -1 ){
      Logger.log('Yes'); // 'Yes'
  } 
return 'done';
}