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Lodash _.dropRightWhile() Function - GeeksforGeeks

Last Updated : 30 Aug, 2024

Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc. The _.dropRightWhile() function is used to delete the slice of the array excluding elements dropped from the end until the predicate function returns false.

Syntax: 

_.dropRightWhile(array, [predicate=_.identity])

Parameter:

• array: It is the array from which the elements are to be removed.
• predicate: It is the function that iterates over each element of the array and returns true or false on the basis of the condition given.

Return: It returns the array.

Note: Install the lodash module by using the command npm install lodash before using the code given below.

Example 1: 

// Requiring the lodash library
const _ = require("lodash");

// Original array
let array1 = [
    { "a": 1, "b": 2 },
    { "a": 2, "b": 1 }, 
    { "b": 2 }
]

// Using _.dropRightWhile() function
let newArray = _.dropRightWhile(array1, (e) => {
    return e.b == 2;
});

// Original Array
console.log("original Array: ", array1)

// Printing the newArray
console.log("new Array: ", newArray)

Output: 

Example 2:

In this example, the predicate function returns false it does not check further and returns the sliced array. Please note that it is different from drop while as it drops element from the right side and not left.

// Requiring the lodash library
const _ = require("lodash");

// Original array
let array1 = [1, 2, 4, 3, 4, 4]

// Using _.dropRightWhile() function
let newArray = _.dropRightWhile(array1, (e) => {
    return e == 4;
});

// Original Array
console.log("original Array: ", array1)

// Printing the newArray
console.log("new Array: ", newArray)

Output: 

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