Lodash | _.remove() Method

The _.remove() method is used to remove all elements from the array that predicate returns True and returns the removed elements.

Syntax:

_.remove(array, function)

Parameters: This method accept two parameters as mentioned above and described below:  

• array: This parameter holds the array that need to be modify.
• function: This parameter holds the function that invoked per iteration.

Return Value: It returns an array of removed elements.

Example: Here all the elements returning true are even elements. The function is invoked on all the elements (n) of the array. 

Javascript

let x = [1, 2, 3, 4, 5];

let even = _.remove(x, function(n) {
    return n % 2 == 0;
});

console.log('Original Array ', x);
console.log('Removed element array ', even);

Here, const _ = require(‘lodash’) is used to import the lodash library into the file.

Output:

Original Array  [ 1, 3, 5 ]
Removed element array  [ 2, 4 ]

Example 2: This example removes all the vowels from an array containing alphabets and store them in a new array.  

Javascript

const _ = require('lodash');

let x = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'];

let vowelArray = _.remove(x, function(n) {

    let vowels = ['a', 'e', 'i', 'o', 'u'];

    for (let i = 0; i < 5; i++)
    {
        if (n === vowels[i])
        {
            return true;
        }
    }
});

Output:

Original Array  [ 'b', 'c', 'd', 'f', 'g', 'h' ]
Removed element array  [ 'a', 'e', 'i' ]

Example 3: This example removes all the integers from a given array containing floats, characters, and integers. 

Javascript

let x = ['a', 'b', 1, 5.6, 'e', -7, 'g', 4, 10.8];

let intsArray = _.remove(x, function(n) {

    return Number.isInteger(n);
});

console.log('Original Array ', x);
console.log('Removed element array ', intsArray);

Output:

Original Array  [ 'a', 'b', 5.6, 'e', 'g', 10.8 ]
Removed element array  [ 1, -7, 4 ]

Note: This will not work in normal JavaScript because it requires the library lodash to be installed.
Reference: https://lodash.com/docs/4.17.15#remove