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Lodash _.difference

Overview

The lodash _.difference method is a utility function that allows developers to subtract one array of values from another array of values, returning the difference as a new array. This method compares the values in one array with the values in another array, and returns only the values that are present in the first array but not in the second array.

The _.difference method takes two arguments: the first is the array that you want to find the difference of, and the second argument is the array that you want to subtract from. The method returns a new array with the difference of the two arrays.

Here is the syntax for using the _.difference method:

_.difference(array, values)

The array argument is the array to inspect, and values is the array of values to exclude. The method returns a new array of filtered values.

The _.difference method works by taking the first argument, array, and iterating over each value in the array. For each value, it checks whether the value is present in the second array, values. If the value is not present in values, it is added to a new array of filtered values.

Here is an example of how to use the _.difference method:

const firstArray = ['apple', 'banana', 'orange', 'pear'];
const secondArray = ['banana', 'grape'];
const filteredArray = _.difference(firstArray, secondArray);
console.log(filteredArray); // ['apple', 'orange', 'pear']

In this example, the _.difference method is used to subtract the values in secondArray from firstArray, returning a new array of values that are present in firstArray but not in secondArray. The resulting array, filteredArray, contains the values 'apple', 'orange', and 'pear'.

Overall, the lodash _.difference method is a useful utility function for filtering an array to only include values that are not present in another array. Its simple syntax and flexibility make it a powerful tool for working with arrays in JavaScript projects.