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Lodash _.forEach

Overview

The lodash library provides a variety of utility functions for working with arrays, objects, functions, and strings in JavaScript. One such method is the _.forEach method, which is used to iterate over a collection of items and perform a given action on each item.

The _.forEach method syntax is as follows:

_.forEach(collection, [iteratee=_.identity])

Where:

  • collection is the collection to iterate over, which can be an array, object, or string.
  • iteratee is the function that is executed for each item in the collection. This function takes three arguments: the value of the current item, the index or key of the current item, and the entire collection.

Here's an example of using _.forEach to iterate over an array:

const array = ['a', 'b', 'c'];
_.forEach(array, function(value, index, collection) {
  console.log(value);
});

Output:

a
b
c

In this example, the _.forEach method is used to iterate over an array of strings and log each value to the console.

The _.forEach method can also be used with objects:

const object = { 'a': 1, 'b': 2, 'c': 3 };
_.forEach(object, function(value, key, collection) {
  console.log(key + ': ' + value);
});

Output:

a: 1
b: 2
c: 3

In this example, the _.forEach method is used to iterate over an object and log each key/value pair to the console.

The _.forEach method is useful when you want to iterate over a collection and perform a specific action for each item, without having to write a for loop or use the Array.prototype.forEach method. Additionally, the _.forEach method can be chained with other lodash methods to perform more complex operations on a collection.

Overall, the _.forEach method is a powerful tool for working with collections in JavaScript, providing a performant and easy-to-use way to iterate over arrays, objects, and strings.