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What is set.removeFirst() method in Swift?

Theodore Kelechukwu Onyejiaku

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

The removeFirst() method in Swift is used to remove the first element of a set. The order of a set is different. The first element that appears in the first position of a set is not necessarily the first element.

Syntax

set.removeFirst()
Syntax for removeFirst() method of a Set

Parameter

This method doesn't take any parameters.

Return value

Thi method returns the first removed element.

Code example

Let's look at the code below:

// create some sets
var names: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
var workers: Set = ["Dorothy", "Stephen", "Jane"]
var numbers: Set = [1, 2, 3, 4, 5, 7, 8, 9, 10]
// pop and return first element
print(names.removeFirst())
print(names.removeFirst())
print(workers.removeFirst())
print(numbers.removeFirst())
Removing the first element of a set in Swift

Explanation

  • Lines 2 to 4: We create some set instances and initialize them with some elements.
  • Lines 7 to 10: We use the removeFirst() method to remove the first elements of the sets and print to the console.

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CONTRIBUTOR

Theodore Kelechukwu Onyejiaku

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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