#concat() ====> joins two or more arrays and return result;
#includes() ====> check if an array contains a specific element;
#push() ====> add a new element to the end of an array and return the new lenght of the array;
#unshift() ===> adds a new element to the beginning of an array and return the new length of the array;
#pop() =====> removes the last element of an array and return the removed element;
#shift() =====> removes the first element of an array and returns the removed element;
#sort() ====> sorts the elements alphabetically in strings and in ascending order;
#slice() =====> selects the part of an array and return the new array;
#splice() =====> removes or replaces existing elements and/or adds new elements;