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Justin Joyce

Practical tips and tutorials about software development.

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Archives for March 2023

Save your shell history to log files

Posted Mar 28, 2023 — Updated Oct 26, 2023

Every command I enter on my computer is written to a log file. These logs have come in handy countless times; I tell anyone who will listen to save their logs too. My inspiration for doing this came from this atomic object post many years ago, and I am so glad I followed their advice. […]

Filed Under: Command Line, Featured, Productivity, Tips

Javascript map function

Posted Mar 27, 2023 — Updated Jan 10, 2024

The javascript map() function takes in a callback function, applies that callback function to each element of an array, and returns a new array containing the results. Many languages have a map function, and they all behave roughly this way. Javascript map basics map() accepts a single callback function, and passes each element of the […]

Filed Under: Arrays, Javascript

Javascript forEach

Posted Mar 13, 2023 — Updated Jan 10, 2024

Javascript’s forEach method is one of its basic array methods, and it’s used all the time. It does as its name suggests, and performs a function for each element of an array: In the function above, I only accessed one argument, item. However, forEach actually makes 3 arguments available to its callback function if you […]

Filed Under: Arrays, Javascript

Python for loops

Posted Mar 6, 2023 — Updated Jan 10, 2024

For loops in Python are one of many features that make Python so popular; they’re as close to plain English as you can get when writing software. They generally look like this: What is an iterable? According to the Python docs an iterable is: An object capable of returning its members one at a time. […]

Filed Under: Python

Pointers in Go

Posted Mar 4, 2023 — Updated Jan 10, 2024

If you’re used to working in dynamic languages like Javascript, Ruby, or Python, Golang feels very different. One of the big differences is the explicit use of pointers. You might find yourself asking these questions: I have practical answers! Golang ampersand & and asterisk * Obtain an address with & Let’s start with &. It […]

Filed Under: Golang

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