This is part 23 of my journey learning Golang. Random number generators For some kinds of programs, like simulations, games, or test code, it is useful to be able to generate unpredictable sequences of numbers. While generating truly random numbers is a hard problem (see RANDOM.ORG), a common alternative is to use a …

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This is part 22 of my journey learning Golang. Variable scopes A common source of errors in programming is using the same variable in many different parts of a program. For a deep dive into the problems that this practice can cause, take a look at Global Variables Are Bad. A common solution that is adopted by most …

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This is part 21 of my journey learning Golang. Chained conditions It is a common pattern for a program to have a sequence of conditional statements testing for different values of the same variable or function result. For instance: 1package main 2 3import ( 4 "fmt" 5) 6 7func main() { 8 x := 0 9 y := 0 10 for …

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This is part 20 of my journey learning Golang. Boolean algebra Boolean algebra is about logical operations applied to the boolean values true and false. The most common operations are “and” (conjunction), “or” (disjunction) and “not” (negation). Fun fact: it is called …

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This is part 19 of my journey learning Golang. Conditionals Any program can be written in terms of three control structures: the sequence structure, in which expressions are executed in sequence, one after the other, in the order that they are written; the selection structure, in which a statement can be executed or …

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This is part 18 of my journey learning Golang. Command line interface When building programs that run on a terminal it is often useful to be able to allow the user to enter text. For instance the ssh-keygen utility will prompt for a path and a passphrase. 1❯ ssh-keygen -t rsa -b 4096 -C "your_email@example.com" …

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This is part 17 of my journey learning Golang. The fmt package has methods like Print, Println and Printf to print text to the standard output device. It also has corresponding methods that return the strings that would be printed out, instead of actually printing them out. Afterwards the program can use the returned …

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This is part 16 of my journey learning Golang. The Printf method The Printf method from the fmt package writes a formatted string to standard output. Printf makes it possible to interpolate strings. This is done by leaving placeholders in a string, and using values to fill in these placeholders. Printf syntax Printf …

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This is part 15 of my journey learning Golang. fmt Package Go’s fmt package implements formatted I/O with formatting functions in the venerable, old-school style of the C language, but modernized. This article covers the most basic functions for printing out text Println and Print: Println The Println method …

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This is part 14 of my journey learning Golang. As an exercise for Codecademy’s Learn Go course, I wrote my second Go program. It simulates a catalog for a comic book store. At this point the course has only covered the most fundamental parts of Go, like variables, simple data types, basic arithmetic, and …

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