To limit decimal places in JavaScript, use the toFixed() method by specifying the number of decimal places. This method: For instance, let’s round to 2 decimals: Output: But this is just one way to do it. Also, it has some caveats. This is a comprehensive guide to rounding values in JavaScript. You will learn how […]
How to Limit Decimal Places in JavaScript Read More »
The ‘u’ in front of a string means the string is a Unicode string. A Unicode is a way for a string to represent more characters than a regular ASCII string can. In Python 2.x shell, you can see how for example a text written in Russian converts to a Unicode string with ‘u’ in
Python What Does ‘u’ Mean in Front of a String Read More »
To return multiple values from a Python function, use a comma to separate the return values. For instance, let’s create a function that takes two numbers as arguments. This function returns the sum, difference, multiplication, and division between these two numbers. Here is how it looks in the code: Now you can call this function
How to Return Multiple Values from a Python Function Read More »
To filter an array in Swift: For instance, let’s filter an array of words such that only words less than 4 characters long remain: Output: This is the quick answer. But to know how filtering really works in Swift, please read along. How to Filter an Array in Swift In the introduction, you saw a
How to Filter an Array in Swift Read More »
You can use a final class in Swift to disable the inheritance of the class. For example, let’s create a class Student and make it a final class to disallow inheritance: If you now try to subclass this class, you are going to see a compile-time error: Output: This error says it is not possible
What Is a Final Class in Swift Read More »
A completion handler in Swift is a function that calls back when a task completes. This is why it is also called a callback function. A callback function is passed as an argument into another function. When this function completes running a task, it executes the callback function. Example Here is a demonstrative (but not
What Is a Completion Handler in Swift Read More »
To read the last line of a file in Python without storing the entire file in memory: Here is an example: The Naive Approach The most naive approach to read the last line of a file in Python is: Here is the code: Find the Last Line of a Large File in Python If you
How to Read the Last Line of a File in Python Read More »
To check if a Swift array contains an object with a specific property: For instance, let’s find out if a student called Bob is in an array of students: To understand how this works and to get the context, please read along. Full Example with Context First of all, let’s give context to the above
Swift Check If an Array Contains an Object with Property Read More »
To get the current time in Swift: For example, let’s show what time it is right now in the console: Output: A Deeper Dive Let’s take a closer look at the above Swift code. This Swift code imports the Foundation framework, which provides fundamental data types, collections, and operating-system services to the Swift programming language.
How to Get Current Time in Swift (Quick 3-Step Guide) Read More »
To calculate the time difference between two Date objects in seconds in Swift, use the Date.timeIntervalSinceReferenceDate method. For example, let’s calculate how many seconds is between Christmas and New Year: Output: Date Difference Extension in Swift If you need to compute time differences between two dates more often in your project, feel free to write
Swift Time Difference Between Date Objects in Seconds Read More »
