See the Pen slice by Cloudinary (@Cloudinary) on CodePen.
> Shallow copy means we copy a reference to a new variable using the assignment operator (`=`). Because it's a reference, updating values in the original also updates the copy. Deep copy, by contrast, creates a separate memory location, so changes to the original don't bleed through. `slice()` hands you a new array with the extracted elements, as shown in the embedded example above. # splice `splice()` has a different signature, and it **does** modify the original array by removing and/or replacing elements. ```javascript splice(start, count, ...itemN) ``` `start` is mandatory. The others are optional. `start` is the index where the modification begins. Interestingly, if this value exceeds the array's length, `splice()` acts as a pure add operation, appending any `itemN` elements. `count` tells the method how many elements to delete, starting from `start`. If you leave it out, the deletion runs with `array.length - start`. Passing `0` or a negative number skips deletion, but you can still add new elements via `itemN`. `itemN` specifies elements to insert at the `start` position. Leave it out and `splice()` just removes elements. A few examples below. Remember that `splice()` mutates the original array, so run each section independently.See the Pen splice by Cloudinary (@Cloudinary) on CodePen.