flip (Lodash Compatibility)

Use direct argument reversal

This flip function simply reverses the order of function arguments. In most cases, it can be replaced with simpler approaches.

Instead, use the faster and more modern (...args) => func(...args.reverse()) or direct argument passing.

Creates a function that reverses the order of arguments for the given function.

const flippedFunc = flip(func);

Reference

flip(func)

Use flip when you want to create a new function by reversing the order of arguments. It changes the function to receive arguments from the last one first instead of the original order from the first one.

import { flip } from 'es-toolkit/compat';

function greet(greeting: string, name: string) {
  return `${greeting}, ${name}!`;
}

const flipped = flip(greet);
flipped('John', 'Hello'); // 'Hello, John!'

// The original function takes (greeting, name) order
// But the flipped function takes (name, greeting) order

For functions that accept multiple arguments, all arguments are reversed.

import { flip } from 'es-toolkit/compat';

function fn(a: string, b: string, c: string, d: string) {
  return [a, b, c, d];
}

const flipped = flip(fn);
flipped('1', '2', '3', '4'); // ['4', '3', '2', '1']

Parameters

• func (F): The function to reverse arguments for.

Returns

((...args: Reversed<Parameters<F>>) => ReturnType<F>): Returns a new function with reversed arguments.