eachRight (Lodash Compatibility)

Use forEachRight from es-toolkit

This eachRight function operates slowly due to handling null or undefined, ArrayLike type processing, support for various predicate function formats, etc.

Instead, use the faster and more modern forEachRight from es-toolkit.

Performs an iteration operation from right to left on each element of an array or object.

const result = eachRight(collection, iteratee);

Reference

eachRight(collection, iteratee)

Iterates through each element of an array, object, or string from right to left and executes the given function. For arrays, it iterates in reverse order from the last index; for objects, it iterates through enumerable properties in reverse order.

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

// Iterate array in reverse order
eachRight([1, 2, 3], (value, index) => console.log(value, index));
// Logs: 3 2, 2 1, 1 0

// Iterate object in reverse order
eachRight({ a: 1, b: 2 }, (value, key) => console.log(key, value));
// Logs: 'b' 2, 'a' 1

// Iterate string in reverse order
eachRight('hello', (char, index) => console.log(char, index));
// Logs: 'o' 4, 'l' 3, 'l' 2, 'e' 1, 'h' 0

If the function returns false, iteration stops.

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

eachRight([1, 2, 3, 4], value => {
  console.log(value);
  return value !== 2; // Stop at 2
});
// Logs: 4, 3, 2

Parameters

• collection (ArrayLike<T> | Record<any, any> | string | null | undefined): The collection to iterate over.
• iteratee ((item: any, index: any, collection: any) => unknown, optional): The function to execute for each element. Default is the identity function.

Returns

(ArrayLike<T> | Record<any, any> | string | null | undefined): Returns the original collection.