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M1

How to install old Ruby versions on Apple M1

The problem with installing older Ruby versions, is that OpenSSL, a dependency of older Ruby versions, is "end of life" and not shipped using brew anymore. Later versions of OpenSSL are not compatible. The only way to install older Ruby versions now, is to

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FAANG

How I would solve the Facebook iOS App Design Interview

Last week, a reader contacted me to explain issues he was facing in his recent interview with Facebook. During the System Design challenge, he was asked to design a Mobile

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Swift

How to build an App Icon switcher in Swift

App icons are the first point of engagement for your users, an effective tool to catch their attention, and keep them away from exploring other potential options. Having alternative icon

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FAANG

How I Cracked the Object Oriented Design Interview at Amazon

The most prominent questions to last week's article, "How I got into FAANG", revolved around the Object Design interview. Namely, "what it is?", "how to prepare for it?" as well

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FAANG

How I got into FAANG

Over the past months, many colleagues and friends have asked about my preparation, interviewing experience, and how my life has changed since I joined Amazon as a Software Development Engineer,

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Firebase

Push Notifications with Firebase and Swift

Push Notifications have always been a big subject. You can find countless threads on StackOverflow, videos on YouTube, and even entire books on them. To keep the scope of this

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SwiftUI

How to write a poker bot in SwiftUI

As some of my followers, and most of my friends know, I love poker. As an engineer, efficiency and automation are always at the forefront of my mind. Therefore, when

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Binary Search Tree

Search in a Binary Search Tree

LeetCode’s challenge of the day on June 15, 2020 (#700) asks us to search a Binary Search Tree and return the node where node.val equals the target value.

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Medium

Building a Set API

LeetCode's challenge of the day on June 12, 2020 (#380) asks us to create an API wrapper around the standard Swift Set implementation. The only given requirement is that all

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Easy

The Power of Two

LeetCode's challenge of the day on June 8, 2020 (#231) asks us to write a function that determines if the given Integer n is a power of two. In other

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LeetCode

Traversing BST in Level Order

LeetCode's challenge #102 asks us to traverse a Binary Search Tree in level order. Level order traversal is the key to solve a multitude of tech challenges and comes up

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LeetCode

Reversing a String

LeetCode's challenge of June 4, 2020 (#344) asks us to reverse a String. This task can be achieved with 1 line of code, yet it's worth exploring the different options.

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LeetCode

Delete Node in a Linked List

LeetCode's challenge of June 2, 2020 (#237) asks us to delete a Node from a LinkedList. The tricky part is that we only have access to the Node itself, not

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LeetCode

Adding Two Linked Lists

LeetCode's challenge #2 asks us to sum up two Linked Lists and return one singly Linked List. The given lists are (2 -> 4 -> 3) and (5

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LeetCode

Solving the Two Sum Problem

The two sum problem is a classic coding challenge required in many tech interviews, and the #1 challenge on leetcode.com. Usually, one is given an unsorted array of integers