JS Practice — Built-in Objects

Array.prototype.slice() — shallow copy

📖 Usage Example

const original = [1, 2, 3]
const copy = original.slice()  // shallow copy
copy !== original  // → true

Call slice() with no arguments to create a shallow copy of an array.

Array.prototype.slice() — copying an array

Calling slice() with no arguments returns a shallow copy of the entire array. This is a common pattern to duplicate an array without mutating the original.

Challenge: Implement shallowCopy(arr) that returns a full copy using arr.slice().

shallowCopy([1, 2, 3]) // → [1, 2, 3]  (new array reference)

💡 Hints (2)

• `arr.slice()` with no arguments is equivalent to `arr.slice(0)`.
• The returned array is a new object — modifying it does not affect the original.