There are some important array methods in JavaScript some of them are as follows:

1. toString() - Converts an array to a string of comma-separated values

2. join() - joins all the array elements using a separator

3. pop() - removes the last element from the array

4. push() - Adds new elements at the end of the array

5. shift() - Removes first element and returns it

6. unshift() - Adds elements to the beginning. Returns new array length

7. delete - Array elements can be deleted using the delete operators

8. concat() - Used to join array to the given array

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