JavaScript, those methods to change the original array

Those methods alter the original array

1. fill()

   grammar

   array.fill(value, start, end)

   parameter

   parameter	description
   value	essential. Fill.
   start	Optional. Start filling position.
   end	Optional. Stop filling position (by default Array .length)

2. pop()

   grammar

   array.pop()

   This method changes the length of the array

3. push()

   grammar

   array.push()

   Add one or more elements to the end of the array, and returns the new length.

   This method changes the length of the array

4. reverse()

   grammar

   array.reverse()

   Change the original array

5. shift()

   grammar

   array.shift()

   This method changes the length of the array

6. sort()

   Definition and Usage

   sort () method is used to sort the elements of the array.

   Sort order may be letters or numbers, in ascending or descending order.

   The default sort order is ascending alphabetical order.

   Note: When the digital in alphabetical order "40" will be in the front row "5."

   Using digital ordering, you must be called by a function as a parameter.

   It is a function of the specified number in ascending or descending order.

   Note: This method changes the original array! .

   Parameter Values

   parameter	description
   compareFunction	Optional. The provisions of the sort order. It must be a function.

   • If no callback function is safe in ascending alphabetical order

   • If you provide a callback function then returns the value according to the callback function to sort, sort () will be an array of every element except the last element calls the callback function,

     The callback function requires two parameters, the first parameter represents the current element, the second argument represents an element after the current element (and therefore does not call for the last element)

   • a and b are two elements to be compared:

   • If compareFunction(a, b)less than 0, then a is arranged before B;

   • If compareFunction(a, b)equal to 0, the relative position of a and b unchanged. Note: ECMAScript standard does not guarantee this behavior, but not all browsers will follow (eg Mozilla versions prior to 2003);

   • If compareFunction(a, b)greater than 0, b is arranged before a.

   • compareFunction(a, b) It must always return the same result of the comparison to the same input, otherwise the sort of result will be uncertain.

7. splice()

   grammar

   array.splice(index,howmany,item1,.....,itemX)

   Parameter Values

   parameter	description
   index	essential. Where the provisions of add / remove elements. This parameter is inserted starting and (or) an array element subscript deleted, it must be numeric.
   howmany	Optional. It specifies how many elements should be removed. It must be a number, but can be "0." If this parameter is not specified, then remove all elements from index to the end of the original array.
   item1, ..., itemX	Optional. To add a new element to the array

   return value

   Type	description
   Array	It returns an array containing the elements to be deleted.

8. unshift()

   Add one or more elements to the beginning of an array and returns the new length.

   grammar

   array.unshift(item1,item2, ..., itemX)

   Parameter Values

   parameter	description
   item1,item2, ..., itemX	Optional. Adding one or more elements of the array to the initial position.