slice vs splice

#Differences

1. The signature of methods are different.
   array.slice(startingIndex, endingIndex);
   array.splice(startingIndex, length, ...items);

   While the first parameter are the same as each other indicating the starting index of removed elements, the second parameters aren't.
   The second parameter of `slice` and `splice` are the ending index and the number of sub items, respectively.
   With the `splice` method, it's possible to keep the items not to be removed from the original array by passing them to the last parameters.
2. `splice` changes the original array, while `slice` doesn't.
   Given the array of numbers from 1 to 5:
   const array = [1, 2, 3, 4, 5];
   const sub = array.splice(2, 3);
   
   // The original array is modified
   array; // [1, 2]
   sub; // [3, 4, 5]

   Now, let's pass the same parameters to `slice`:
   const array = [1, 2, 3, 4, 5];
   const sub = array.slice(2, 3);
   
   // The original array isn't modified
   array; // [1, 2, 3, 4, 5]
   sub; // [3]

#Tip

const clone = (arr) => arr.slice(0);