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Get all elements of an array dropping first "n" elements in Swift
Programming Bytes
Overview
We can use the dropFirst method to drop the first n elements and return the remaining elements of a particular array.
Syntax
func dropFirst(_ k: Int = 1) -> ArraySlice<Element>
Syntax for the "dropFirst" method
Parameters
The number of elements that need to be dropped from the beginning of the array is passed as an array. This is an optional argument. The default value of the argument is 1.
Return value
This method returns an array. If 0 is passed as an argument, then no element is supposed to be removed from the array. If we pass a value that is larger than the length of the array, then an empty array is returned.
Code
The code written below demonstrates how we can get all the elements of an array after dropping the first n elements in it:
import Swift
// create a array with 5 elements
let numbers = [1, 2, 3, 4, 5]
// drop first element of the array
print(" The array is - \(numbers)")
// drop first element of the array
print("\n numbers.dropFirst() - \(numbers.dropFirst())")
// drop first 2 elmenets of the array
print("\n numbers.dropFirst(2) - \(numbers.dropFirst(2))")
// drop first 10 elmenets of the array
print("\n numbers.dropFirst(10) - \(numbers.dropFirst(10))")
Implementation of the "dropFirst" method
Code explanation
- Line 4: We create a new array,
numbers, with 5 elements. - Line 10: We use the
dropFirstmethod without any argument(s). ThedropFirstmethod drops the first element of the array and returns the other elements as a new array. We get [2,3,4,5] as a return value. - Line 13: We use the
dropFirstmethod with2as an argument. ThedropFirstmethod drops the first two elements of the array and returns the other elements as a new array. We get [3,4,5] as a return value. - Line 16: We use the
dropFirstmethod with10as an argument. The argument value is greater than the length of the array, so thedropFirstmethod returns an empty array.
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arrayutils
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