Generic Functions

function functionName<Value>(param: Value): Value {
	return param
}

identity<string>('hello') // Explicit: Value is string
identity(42) // Inferred: Value is number

1. Create a generic identity function that takes a value and returns the same value (preserving its type)
2. Create a generic last function that takes an Array<Item> and returns Item | undefined (the last element, or undefined for an empty array)
3. Export identity and last by name

Completion criteria

• Named exports: identity, last
• identity returns the same value for strings, numbers, booleans, and null
• last([1, 2, 3]) → 3; last(['a', 'b', 'c']) → 'c'; last([]) → undefined