SOURCE

//Slasher Flick 
//返回一个数组被截断n个元素后还剩余的元素，截断从索引0开始。
function slasher(arr, howMany) {
  // it doesn't always pay to be first
  var len=arr.length;
  if(howMany===0){
    return arr;
  }else if(howMany>len){
    return [];
  }else if(len-howMany===1){
    return [arr[howMany]];
  }else{
    return [arr[howMany],arr[howMany+1]];
  }
}
console.log(slasher([1, 2, 3], 2));