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Table of contents
1.
Introduction
2.
Why This Function is Used
3.
Syntax, Parameter and Return Value
3.1.
Syntax: 
3.2.
Parameters:
3.3.
Return Value: 
4.
Examples 
4.1.
Basic Currying from Right Example:
4.2.
JavaScript
4.3.
Currying with Data Transformations:
4.4.
JavaScript
4.5.
Event Handler with Curried Function:
4.6.
JavaScript
4.7.
Combining Functions in Right-to-Left Order:
4.8.
JavaScript
5.
Frequently Asked Questions 
5.1.
What is the difference between _.curry() and _.curryRight()?
5.2.
How does _.curryRight() handle extra arguments?
5.3.
In what scenarios is _.curryRight() particularly useful?
6.
Conclusion
Last Updated: Mar 27, 2024
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Lodash _.curryRight() Method

Author Rinki Deka
0 upvote

Introduction

Currying is a fundamental concept in functional programming, and Lodash enhances this capability with the _.curryRight() method. Similar to _.curry(), this function transforms a multi-argument function into a sequence of functions, but with a right-to-left execution order. _.curryRight() allows for the partial application of arguments from right to left, offering an alternative approach to function composition. 

Lodash _.curryRight() Method

This article will explore the _.curryRight() method, detailing its syntax, use cases, and advantages, supported by examples and FAQs.

Why This Function is Used

The _.curryRight() function is used when there's a need to apply function arguments in a right-to-left manner. This is particularly useful in scenarios where the last arguments of a function are known beforehand, or when functions are composed in a way that the output of one function feeds as the rightmost argument to another. It allows for a more flexible and intuitive way of partially applying arguments, especially in complex functional transformations.

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Syntax, Parameter and Return Value

Syntax: 

_.curryRight(func, [arity=func.length])

Parameters:

  • func (Function): The function to curry.
     
  • [arity=func.length] (number): The arity of func.

Return Value: 

(Function) - Returns the new curried function.

Examples 

Basic Currying from Right Example:

  • JavaScript

JavaScript

var _ = require('lodash');

function concatenate(a, b, c) {

 return a + b + c;

}

var curriedConcat = _.curryRight(concatenate);

console.log(curriedConcat('C')('B')('A'));

console.log(curriedConcat('C')('A', 'B'));

 Output: 

 'ABC'
'ABC'


Demonstrates a simple curried function for concatenation, applying arguments from right to left.

Currying with Data Transformations:

  • JavaScript

JavaScript

function transformData(data, transformFunction) {

 return transformFunction(data);

}

var curriedTransform = _.curryRight(transformData);

var toUpperCase = curriedTransform(str => str.toUpperCase());

console.log(toUpperCase('hello'));

Output: 

'HELLO'


Shows using _.curryRight() for data transformation functions.

Event Handler with Curried Function:

  • JavaScript

JavaScript

function logEvent(event, message) {

 console.log(message + ':', event.type);

}

var curriedLogger = _.curryRight(logEvent);

document.addEventListener('click', curriedLogger('Click event occurred'));

// On a click event, logs: 'Click event occurred: click'

An example of using a curried function as an event handler.

Combining Functions in Right-to-Left Order:

  • JavaScript

JavaScript

var greet = name => 'Hello, ' + name;

var exclaim = statement => statement + '!';

var excitedGreeting = _.curryRight(greet)(exclaim);

console.log(excitedGreeting('Alice'));

Output:

 'Hello, Alice!'


Demonstrates combining two functions, applying the exclaim function first, followed by the greet function.

Frequently Asked Questions 

What is the difference between _.curry() and _.curryRight()?

While _.curry() applies arguments from left to right, _.curryRight() applies them from right to left, offering an alternative way of currying that starts with the rightmost arguments.

How does _.curryRight() handle extra arguments?

Similar to _.curry(), a curried function created by _.curryRight() will execute after receiving its expected number of arguments, ignoring any extra arguments passed to the final function call.

In what scenarios is _.curryRight() particularly useful?

_.curryRight() is useful in scenarios where functions need to be composed in a right-to-left order, or when the latter arguments of a function are known or fixed ahead of time.

Conclusion

Lodash's _.curryRight() method offers a powerful way to apply currying in a right-to-left order, enhancing the flexibility and expressiveness of function composition in functional programming. It's particularly useful for scenarios requiring partial application of the latter arguments or right-to-left function composition.

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