Answers for "how to i write a js function that removes a list from another list"

javascript remove from array by index

//Remove specific value by index
array.splice(index, 1);

how to delete an element from an array in javascript

["bar", "baz", "foo", "qux"]list.splice(0, 2) // Starting at index position 0, remove two elements ["bar", "baz"] and retains ["foo", "qux"].