This code checks the background of a certain number of cells.

var array = sheet.getRange(1, 1, 20, 1).getBackgrounds();

If I log this array in the Google Apps Script console, it returns the following array:

[[#cccccc], [#ffffff], [#ffffff], [#ffffff], [#ffffff], [#cccccc], [#ffffff], [#ffffff], [#ffffff], [#ffffff], [#f3f3f3], [#ffffff], [#ffffff], [#ffffff], [#ffffff], [#ffffff], [#cccccc], [#cccccc], [#ffffff], [#ffffff]]

I want to check if this array does not contain a certain color code: #377a47.

I tried to use includes for this, however this does not work as the value is an array and not a string.

console.log(!array.includes("#377a47")); // returns true

This should return true, as the array does not contain this #377a47 color code. And it does return true, however it also returns true if I try the following color code that is present in the array:

console.log(!array.includes("#cccccc")); // returns true

So apparently this is not the right way to check if the array does not contain #377a47. I suspected it had something to do with the fact it is a nested array, but am not sure how to correctly write the code to check this.

My Question: How to correctly check if the array does not contain the color code #377a47?