1.1.1.Pass array by value

• 在js中, 將array傳入function中做運算若沒有經過處理將會以pass by reference傳入, 因此當在function中的array內容被改變, 將會影響原本的array

• 為了避免此情況, 可以將array以pass by value的方式傳入, 以避免污染原有的array

• pass by reference v.s. pass by value

  • native array method - "slice()" will return a shallow copy of the array.

• https://codepen.io/JenHsuan/pen/aJjVov?editors=0012

• reference

• https://codepen.io/JenHsuan/pen/aJjVov?editors=0012