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Lodash _.includes


The lodash _.includes method is a utility function that checks whether a given value is present among the values in a collection. It is part of the popular Lodash library, which provides a set of functions that improve the efficiency and readability of JavaScript code.

The syntax of the _.includes method is straightforward: It takes two arguments, a collection and a value to search for, and returns a boolean value indicating whether or not the value was found in the collection. The method works with various types of collections including arrays, objects, and strings.

The _.includes method is particularly useful when working with arrays. For example, it can be used to determine whether an array contains a particular item, without the need to iterate through the array manually.

To search for a value in an array, pass the array as the first argument and the value to search for as the second argument to the _.includes method. The method will then return true if the value is found in the array and false otherwise.

_.includes([1, 2, 3], 2); // true
_.includes([1, 2, 3], 4); // false

Apart from arrays and objects, the _.includes method also works with strings. In this case, the method will search for the specified substring within the string and return a boolean value indicating whether or not the substring was found.

_.includes('lodash', 'odash'); // true
_.includes('lodash', 'Lorem Ipsum'); // false

One useful feature of the _.includes method is that it allows you to specify a starting index to search from. This can be useful if you only want to search a specific portion of an array or string.

_.includes([1, 2, 3, 4, 5], 3, 2); // true

This will search for the number 3 in the array starting from the index position 2.

In summary, the lodash _.includes method is a simple and efficient way to determine whether a particular value is present within a collection. It works with arrays, objects, and strings, and can be customized to search within specific portions of a collection. By using the _.includes method, you can write more concise and readable code that is also more performant.