To efficiently deal with dataframes and lists in R, you need to be able to access the columns or values in an easy and readable way. This is where you can use the dollar sign operator ($). This operator retrieves the value or column by a name after which you can easily read, modify, or […]
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One of the main benefits of writing computer programs is to automate tasks based on inputs and conditions. Adding logic to code is possible through decision-making if…else statements. For example, a square root function should only compute the square root of an input if its value is positive. Otherwise, the function should warn about false
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Programming is a time-consuming task. Putting together even something really basic takes a long time. One of the key parts of becoming an efficient programmer is the ability to use existing solutions to your advantage. This is where libraries come in handy. A programming library is a collection of useful resources for developers. In most
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In Programming, “Foo” means nothing. It’s a placeholder value for when a programmer cannot come up with a better alternative. Value like “Foo” also highlights the fact that the choice of name is not the relevant part of the code example. You see “Foo” a lot in programming tutorials and lecture slides. Also, if more
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In Python, you can introduce logic to your code with if-else statements. You can use if-else statements to build decision-making capabilities for your program. For example: When you run this piece of code, it tells whether or not you can drive based on your age. Because the age is 10, the program tells you cannot
Python If-Else Statements — Conditional Logic [10+ Examples] Read More »
In Git, you can change the branch with the git checkout command. To change to an existing branch: To create a new branch and switch to it: The above shows you a quick traditional way for changing branches. But in 2019, a new solution git switch was added that’s far more memoizable and convenient, especially
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Python switch-case statements are here as of Python 3.10! These statements are actually called match-case statements. With a match-case statement, you can get rid of rather verbose if-elif-else chains like this: Instead, you can use a compact match-case expression to do the exact same: In some situations, the latter approach is better. It can make
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When you call a function with a yield keyword, the code in the function does not run. Instead, a generator object is created. You can store the generator object to a variable. This generator object has the ability to run the code inside the function on demand. When you invoke the generator object, Python runs
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A Python ternary operator makes it possible to write if-else statements as simple one-liner expressions. Here’s what the syntax of a ternary operator looks like in Python. This is a complete guide to using the ternary operator in Python. You will learn why and when you should or should not use it. The theory is
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To find all the text files with specific text strings on Linux, use grep by running this command in your Terminal: Where: Note (for beginners): You need to keep the quotation marks! Example Use If you’re well-versed in Linux and are already familiar with grep, I’m sure the above answer is more than enough for
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