Javascript basic algorithm(11)--Slasher Flick

Description: 

       Return the remaining elements of an array after chopping off n elements from the head.

       The head means the beginning of the array, or the zeroth index.

Review:  splice();

Solution 1: 使用splice()

 Thinking process: (concept is way more important than fact!!)

       1. splice(index(position),howmany)的用法就是At index position , remove howmany            items.

Code:

      function slasher(arr,howmany){

          arr.splice(0,howmany);  // position index = 0 , remove howmany = howmany;

          return arr;

}

      slasher([1, 2, 3], 2);

     

slasher([1, 2, 3], 2) should return [3].

slasher([1, 2, 3], 0) should return [1, 2, 3].

slasher([1, 2, 3], 9) should return [].

slasher(["burgers", "fries", "shake"], 1) should return["fries", "shake"].

Solution 2: 使用slice();

          Thinking process: 

                    1. slice(a,b)截取從a~b(以前)這段型成新的array 

Code: 

                    function(arr, howmany){

                    return arr.slice(howmany,arr.length); // beginning = howmany end = arr.length

}

     

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