How to use the dropRightWhile function from lodash

Find comprehensive JavaScript lodash.dropRightWhile code examples handpicked from public code repositorys.

lodash.dropRightWhile is a function that returns a new array with elements dropped from the end of the array until the first element for which the predicate returns false.

lodash-contrib.commonjs.js

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module.exports.div                 = _.div;
module.exports.divide              = _.divide;
module.exports.done                = _.done;
module.exports.drop                = _.drop;
module.exports.dropRight           = _.dropRight;
module.exports.dropRightWhile      = _.dropRightWhile;
module.exports.dropWhile           = _.dropWhile;
module.exports.each                = _.each;
module.exports.eachRight           = _.eachRight;
module.exports.endsWith            = _.endsWith;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(drop); // => [2, 3]


const dropRight = _.dropRight([1, 2, 3]);
console.log(dropRight); // => [1, 2]


const dropRightWhile = _.dropRightWhile([1, 2, 3, 4], n => n > 2);
console.log(dropRightWhile); // => [1, 2]


const dropWhile = _.dropWhile([1, 2, 3, 4], n => n < 3);
console.log(dropWhile); // => [3, 4]

+ 15 other calls in file

How does lodash.dropRightWhile work?

lodash.dropRightWhile works by taking two inputs: an array and a predicate function.

The function then iterates over the array from the end, dropping elements until the first element for which the predicate function returns false.

The predicate function is called for each element in the array, with three arguments: the current element, the index of the current element, and the original array.

If the predicate function returns true for an element, that element is dropped from the end of the array. If the predicate function returns false for an element, all remaining elements are included in the returned array.

By using lodash.dropRightWhile, you can quickly and easily drop elements from the end of an array until a certain condition is met, which can be useful for manipulating and filtering data.

lodash.js

GitHub: ThisisNirmalJaiswal/practiceJS

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// console.log(_.dropRight([1, 2, 3]));
// console.log(_.dropRight([1, 2, 3], 2));
// console.log(_.dropRight([1, 2, 3], 5));
// console.log(_.dropRight([1, 2, 3], 0));


// _.dropRightWhile(array, [predicate=_.identity])
// Creates a slice of array excluding elements dropped from the end. 
// Elements are dropped until predicate returns falsey. 
// The predicate is invoked with three arguments: (value, index, array).

+ 5 other calls in file

arrays.js

GitHub: ashishdock/lodash-practice

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  })
);


// this stops as soon as it encounters a false value, if the first value is false, it will stop evaluating rest of the elements
console.log(
  _.dropRightWhile(users, function (user) {
    return user.active === true;
  })
);
// this also stops as soon as it encounters a false value.

+ 5 other calls in file

Ai Example

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const _ = require("lodash");

// Define an array of objects
const users = [
  { name: "Alice", age: 25 },
  { name: "Bob", age: 30 },
  { name: "Charlie", age: 35 },
  { name: "David", age: 40 },
];

// Define a predicate function to drop elements until age is less than 35
const predicate = (user) => (user.age = 35);

// Drop elements from the end of the array until the predicate returns false
const filteredUsers = _.dropRightWhile(users, predicate);

console.log(filteredUsers);
// Output: [{ name: 'Alice', age: 25 }, { name: 'Bob', age: 30 }]

In this example, we first require the lodash library. We then define an array of objects called users, where each object represents a user with a name and an age. We define a predicate function that checks whether the age property of a user object is greater than or equal to 35. We then call lodash.dropRightWhile, passing in the users array and the predicate function as inputs. The function drops elements from the end of the users array until the predicate function returns false. In this case, the predicate function returns true for the last two elements in the users array, so those elements are dropped, leaving us with an array containing the first two elements. The resulting output demonstrates how lodash.dropRightWhile can be used to drop elements from the end of an array until a certain condition is met.

arraydemo.js

GitHub: Hupeng7/es6demo

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    { 'user': 'pebbles', 'active': false },
];
let dropRightWhile1 = _.dropRightWhile(users, function (o) { return !o.active });
console.log('dropRightWhile1--->', dropRightWhile1);
//dropRightWhile1---> [ { user: 'barney', active: true } ]
let dropRightWhile2 = _.dropRightWhile(users, { 'user': 'pabbles', 'avtive': false });
console.log('dropRightWhile2--->', dropRightWhile2);
//dropRightWhile2---> [ { user: 'barney', active: true },
//   { user: 'frey', active: false },
//   { user: 'pebbles', active: false } ]

+ 4 other calls in file

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