JS _.each - JavaScript

Introduction

_.each is a built-in method in Underscore.js library that allows developers to iterate through arrays or objects in JavaScript. This method is commonly used for performing a specific action on every element of an array or object.

Syntax

The syntax of .each method is as follows:

_.each(list, iteratee, [context]);

• "list" is an array or object to iterate over.
• "iteratee" is a function that will be executed for each element in the list. It takes three arguments: the value, the index/key, and the entire list.
• "context" is an optional parameter that sets the context or scope under which the iteratee function will be executed.

The _.each method returns the original list for chaining purposes.

Example

Here's an example of how to use _.each method:

_.each([1, 2, 3], function(num) {
  console.log(num);
});

This will output:

1
2
3

In this example, we have passed an array [1, 2, 3] to the _.each method. The iteratee function iterates over each element of the array and logs it to the console.

Conclusion

The _.each method in Underscore.js is a powerful tool for iterating through arrays and objects in JavaScript. It allows developers to perform specific actions on every element of the list. Understanding this built-in method can make it easier for developers to write more efficient and effective code.