ECMAScript 5 array defines five iterative method.
Each method receives two parameters, the number of values and the group index entries
every(): Given function, if the function returns true for every Returns true to run on each item in the array. filter(): To run on each item in the array for a given function that returns the function returns an array of items to true. forEach(): To run on each item in the array given function. This method has no return value. map(): To run on each item in the array for a given function that returns the results of each array of function call. some(): Given function, the function returns true if any one of the Returns true in the array each run.
The above method does not contain the value of the array changes.