1. variation method
push () method to add one or more elements to the end of the array, and returns the new length.
pop () method removes and returns the last element of the array.
shift () method is used to remove the first element of the array from which, and returns the value of the first element.
the unshift () method to add one or more elements to the beginning of the array, and returns the new length.
splice () method to add / remove items from the array to /, then return items are deleted.
sort () method is used to sort the elements of the array.
reverse () method to reverse the order of elements in the array.
2. Replace Array
filter () method creates a new array of new elements in the array by checking the specified array qualifying all the elements.
concat () method is used to connect two or more arrays.
slice () method returns the selected elements from the existing array.
3. Other
split () method for dividing a character string into a string array.
