St Louis
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7 min readTo implement the Singleton pattern in Kotlin, you can follow these steps:Create a class and make its constructor private to prevent direct instantiation. Declare an object within the class, representing the Singleton instance. This object will be lazily initialized, meaning it will be created when it is first accessed. Optionally, you can define properties and methods within the Singleton object, which will be accessible through the Singleton instance.
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7 min readTo call a C function in Rust, you need to use the Foreign Function Interface (FFI) provided by Rust. Here are the steps involved:Define the C function signature: First, you need to declare the C function signature in your Rust code. This includes the function name, return type, and parameter types. For example, if the C function is defined as int add_numbers(int a, int b), your Rust code should include a declaration like extern "C" fn add_numbers(a: i32, b: i32) -> i32;.
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6 min readIn Kotlin, the let and run functions are useful tools for simplifying and enhancing your code. While both functions have some similarities, they differ in the way they are used and their intended purposes.The let function is used to execute a block of code on a non-null object and allows you to perform operations on that object within the block. It is particularly handy when you want to avoid null checks and ensure safe operations by executing code only if the object is not null.
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3 min readTo convert a char** to a Vec<String> in Rust, you can use the following steps:Collect the C-style strings into CStr slices: use std::ffi::CStr; let c_strs: Vec<&CStr> = (0..size).map(|i| { unsafe { CStr::from_ptr(char_double_ptr[i]) } }).collect(); Convert CStr slices to Rust String objects: let rust_strings: Vec<String> = c_strs.iter().map(|&c_str| { c_str.to_string_lossy().to_string() }).collect(); Here, size is the size of the char** array.
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8 min readIn Kotlin, data classes provide a convenient way to define classes that are primarily used to hold data. They are automatically equipped with useful functionalities like getter and setter methods, toString(), equals(), hashCode(), and copy() methods. Working with data classes in Kotlin involves the following steps:Declaring a Data Class: To declare a data class, use the "data" keyword before the class declaration.
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6 min readIn Rust, the term "where for" does not have a specific or unique meaning on its own. Instead, it is part of the syntax used in generics to specify constraints and requirements for types.When declaring generic functions or structs in Rust, you can use the "where" clause to add extra conditions or bounds on the generic type parameters. This allows you to restrict the types that can be used with the generic code.
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4 min readString interpolation in Kotlin allows you to embed expressions inside a string. This helps create dynamic strings by evaluating and substituting the expressions with their values. To perform string interpolation in Kotlin, you can utilize the following options:Using the $ character: You can use the $ character followed by the expression to interpolate it directly into the string. For example: val name = "John" val age = 25 val message = "My name is $name and I'm $age years old.
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7 min readThe "apply" function in Kotlin is a higher-order function that allows you to modify an object by applying a set of operations to it. It is often used for configuring an object after its initialization or for creating a fluent interface.To use the "apply" function, you first select the object you want to modify and follow it with the "apply" function call using the dot notation.
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6 min readLambdas in Kotlin are a convenient way to write concise and functional code by creating anonymous functions. They allow you to treat functions as variables, which means you can pass them as arguments to other functions or assign them to variables directly.To create a lambda function in Kotlin, you use the { } notation. Inside the curly braces, you define the parameters (if any) and the body of the lambda.
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6 min readIn Kotlin, there are several ways to iterate over collections. Here are some common approaches:For loop: The traditional for loop is available in Kotlin, which can be used to iterate over collections. The loop iterates over each element of the collection and executes the specified code block for each element.
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8 min readThe "when" expression is Kotlin's version of a switch statement. It allows you to execute different blocks of code based on the value of an expression. Here's how you can use it:Start by typing the keyword "when" followed by an opening parenthesis "(".Inside the parentheses, provide the expression whose value you want to evaluate.