I am bad at bitwise operations. So what better way then to create an aide memoir of my learnings. I will update as life goes along. Given an array with two repeated numbers and one single number, how to find the single number using XOR? e.g. array = [4, 4…

We all learn our binary representation of integers in high school or Introduction to Programming 101 classes. The other day, when I was playing with bit-wise masking using Python, I was puzzled how Python represents negative numbers. Turns out, it’s not too different and as usual, you need to use…

Drawing functions to unleash your creativity — In the first part of the titular article (i.e. Part 1), we were introduced to the various data structs and the image.Image interface in the standard golang library. In this part 2, let’s look at compositing. Compositing Compositing is where you have a few images and you want to layer them…

Let your right brain work with your left to unleash your artistic talent Understanding the key elements of the framework Golang is useful and oft mentioned for it’s web development functions. So let’s take sometime to understand the components of the imaging framework to get the lay of the land. Interface image.Image The interface is what you need to…

Step by step guide — High level overview of gRPC Define service using protocol buffer language Generate native code magic glue to tie readable protobuf definition and code (server & client application code you will write) Write Server side code Write Client side code First, what is gRPC? We know RPC stands for Remote Procedure Call. I have also done…

Introduction I have the e-paper hat for the Raspberry Pi, specifically the 2.7 inch display. As I was tickering with Golang as a system programming, I wondered whether I could control the hat using the Go language. After much research, I found the periph.io project, which supports communications via the SPI…

Simply Explained (for Golang) — How to start .proto file? syntax = "proto3"; Without the line above, the complier for protocol buffer will assume the syntax is based on proto2. Specify Field Types All fields are scalar type: string, float, int32, int64, uint32, uint64, sint32, sint64, fixed32 (always 4 bytes), fixed64 , bool, string, bytes etc. message Foo { //this is a message…

We often hear about XSS attacks and the importance of escaping user-submitted content. These attacks are deemed basic and developers may not fully appreciate how easy it is to trigger the attacks. The aim of this article is to show you code on how to go about a XSS attack…

In the sync library that’s part of the official Go package, the following statement is made: Package sync provides basic synchronization primitives such as mutual exclusion locks. Other than the Once and WaitGroup types, most are intended for use by low-level library routines. Higher-level synchronization is better done via channels…