collection[id]["tracks"] is or should be an array with strings inside, it will always not be equal to the string "tracks", as such you are always making collection[id]["tracks"] have value of [value] so if the array already had strings inside you are deleting them - if there are already values you should add new ones to the array instead
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This challenge was really hard for me. But I change my flow of thinking after I saw the hint for this problem.
Now I understand, that I must have a nested IF statement for ‘props’ equal ‘tracks’, then my code will be working good.
Now my code for ‘Collection record’ is like this: