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Lodash _.curryRight

Overview

Overview

Lodash is a popular JavaScript utility library that provides a lot of helpful methods for developers. One of those methods is the _.curryRight method. This method is used to create a curried function that is applied from right to left.

Currying is a functional programming technique that allows you to create new functions from existing functions by fixing some of the arguments. A curried function takes its arguments one at a time, returning a new function with each argument until all the arguments have been passed, and the final result is returned.

The _.curryRight method in Lodash makes it easy to create curried functions that evaluate their arguments from right to left instead of the traditional left to right.

Syntax

The syntax for the _.curryRight method is:

_.curryRight(func, [arity])

Parameters:

  • func - The function to be curried.
  • [arity] - The number of arguments the curried function should accept. If this parameter is not provided, the curried function will accept the same number of arguments as the original function.

Returns:

The _.curryRight method returns a new function that can be called with the remaining arguments.

Usage

Here is an example of how to use the _.curryRight method:

const greet = (greeting, name) => {
  console.log(`${greeting}, ${name}!`);
};

const greeting = _.curryRight(greet);

const sayHello = greeting('Hello');

sayHello('Alice'); // Output: Hello, Alice!

const sayHi = greeting('Hi');

sayHi('Bob'); // Output: Hi, Bob!

In the above example, greet is a function that accepts two arguments: greeting and name. We then use the _.curryRight method to create a new function called greeting that is curried from right to left.

We then call the greeting function twice, each time passing only the first argument. The resulting functions are sayHello and sayHi, which expect the second argument to be passed in when they are called.

When we call sayHello('Alice'), the greeting function is called with the arguments 'Hello' and 'Alice'. The output is Hello, Alice!.

When we call sayHi('Bob'), the greeting function is called with the arguments 'Hi' and 'Bob'. The output is Hi, Bob!.

Conclusion

The _.curryRight method is a powerful functional programming tool that can simplify your code by allowing you to create new functions from existing ones. By using this method, you can easily create curried functions that evaluate their arguments from right to left.