Being confused about when to use generics
Introduction The Go 1.18 release introduced a new feature called generic types (commonly known by the shorter term, generics). This allows writing code with types that can be specified later and instantiated when needed. However, it can be confusing about when to use generics and when not to. In this blog, I will try to describe the concept…
Konika SitoulaOptional Function Parameter Pattern
Go doesn’t support optional function parameters. However, the need for optional parameters will always exist. There are many ways to provide optional parameters to a function in Go, but the most graceful way is to use functional options. Do in this blog we will go through a concrete example and covers different ways to handle…
Project misorganization
Project organization is one of the most common mistake made by Go Developer. Go provides a lots of freedom for designing the packages and modules hence it is not easy task to organize the project. is The purpose of organizing the project are maintainability, readability, consistency and so on.
Any says nothing
The interface type that specifies zero methods is known as the empty interface: interface{} An empty interface may hold values of any type. (Every type implements at least zero methods.) Empty interfaces are used by code that handles values of unknown type. With Go 1.18 the predeclared type any became an alias for an empty…
Creating confusion with octal literals
Octal is a number system with base 8, it has 8 values (0, 1, 2, 3, 4, 5, 6, and, 7). In Go programming language, an octal literal can be written with the prefix 0 (Zero). The value which is prefixed with 0 is considered as an octal value and it can be used in the program statements like…
Neglecting integer overflow
Concepts Integer is a basic data types. Golang supports integer data types extensively. Integer are divided into two types which are signed and unsigned integer. Now we will see it’s types Signed integer in go Types Range Types Range int8 -128 to 127 int16 -32768 to 32767 int32 -2147483648 to 2147483647 int64 -9223372036854775808 to 9223372036854775807 Types…
Comparing values incorrectly
In software development comparing values between fields is a common operation. Writing a function to compare two objects, and testing to compare a value to the expected result are some of the frequently implemented comparisons. While comparing our first insight might be to use the == operator everywhere. But this should not always be the…
Not understanding slices length and capacity
Slice is a variable-length sequence which stores elements of a similar type, you are not allowed to store different type of elements in the same slice. It is just like an array having an index value and length, but the size of a slice is resized they are not in fixed-sized just like an array….
Ignoring the fact that elements are copied in range loops
Range is the form of for loop that iterates over a slice or map. We may forget or be unaware of how a range loop assigns values, leading to common mistakes. First, let’s remind ourselves how to use a range loop; then we’ll look at how values are assigned. Concepts A range loop allows iterating…
Never using named result paramater
In Go return or result parameters can have a named parameter. Having a named parameter eliminates the necessity of having a variable name along with a return parameter as the user can only use a return keyboard to return the result. When a result parameter is named, it’s initialized to its zero value when the…
Using a filename as a function input
While creating a new function that reads the file, passing the filename as an argument is not considered best practice and might have negative effects such as making it difficult to write test cases for a variety of criteria. Suppose we want to implement a function to count the number of empty lines in a…
Ignoring how defer arguments are evaluated
In order to understand how arguments are processed using the defer keyword, let’s consider a specific example. Suppose we have a function that needs to execute two other functions, called foo and bar. Additionally, this function needs to handle some status information related to its execution. We can use the defer keyword to ensure that…