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Lodash _.differenceBy() Method
  • Last Updated : 22 Jul, 2020

The _.differenceBy() method is used to remove the values from the original array by iterating over each element in the array by using the Iteratee function. It is almost same as _.difference() function.

Syntax:

lodash.differenceBy(array, [values], [iteratee=_.identity])

Parameters: This function accepts three parameters as mention above and describe below

  • array: This is the array from which the values are to be removed.
  • values: It is the Array of values that is to be removed from the original array.
  • Iteratee: This is the function that iterate over each element.

Note: If the iteratee function is not given then _.differenceBy() function act as _.difference() function.  

Return Value: This function returns an array.



Example 1:

Javascript




// Requiring the lodash library
const _ = require("lodash");
  
// Ooriginal array
let array1 = [1, 2, 3, 4.2]
  
// Array to be subtracted
let val = [2, 3, 3, 5]
  
// New Array after _.differenceBy() 
// method where Math.double is the
// comparable function
let newArray = _.differenceBy(
    array1, val, Math.double);
  
// Printing the original array
console.log("Before : ", array1);
  
// Printing the output
console.log("After : ", newArray);

Output:

Example 2:

Javascript




// Requiring the lodash library
const _ = require("lodash");
  
// Original array
let array1 = [1, 2, 3, 4.2]
  
// Value array to be subtracted
let val = [2, 3, 4, 5]
  
// new Array after _.differenceBy()
// method where Math.double is the
// comparable function
let newArray1 = _.differenceBy(
    array1, val, Math.floor);
  
// New Array after _.differenceBy function
// where no comparable function is given
let newArray2 = _.differenceBy(array1, val);
  
// Printing the original array
console.log("Before : ", array1);
  
// Nrinting the output
console.log("When compare funct is given: "
        newArray1);
  
// Printing the output
console.log("When compare funct is not given: "
        newArray2);

Output:




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