30.
What does the Array.prototype.concat() method do?
It adds a new element to the beginning of an array.
It returns the number of elements in an array.
It combines two or more arrays into a new array.
It removes the last element from an array.
Correct: C
The concat() method is used to merge two or more arrays into a new array. It does not change the existing arrays, but creates a new array containing the elements of the original arrays in the order they were concatenated.