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Lodash _.isSet


The lodash _.isSet method is a utility function in the Lodash library that is used to determine if a given value is a Set object. The method returns true if the input is detected as a Set object, and false otherwise.

A Set object is a collection of unique values of any type. The values can be primitive types like numbers, strings, or booleans, or they can be objects. The Set object is similar to an array, but with some key differences. While arrays store values in a specific order, a Set object does not have any specific order of how its values are stored. Additionally, Set objects can only contain unique values, meaning no two values are the same.

The _.isSet method is useful when working with Set objects in JavaScript. It can help to determine if a variable is a Set object or not, which can aid in error detection and ensure that the correct methods and operations are used on the input. The method takes a single input parameter, which can be any JavaScript value, and returns a boolean value indicating whether or not the input is a Set object.

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

const lodash = require('lodash');

const set = new Set([1, 2, 3]);
const array = [1, 2, 3];
const string = 'hello';
const object = { a: 1, b: 2 };
const number = 42;

console.log(lodash.isSet(set));    // Output: true
console.log(lodash.isSet(array));  // Output: false
console.log(lodash.isSet(string)); // Output: false
console.log(lodash.isSet(object)); // Output: false
console.log(lodash.isSet(number)); // Output: false

In this example, we first create a Set object named set that stores the values 1, 2, and 3. We then create a regular array array, a string string, an object object, and a number number. We use the _.isSet method to check if each of these values is a Set object. The method returns true for the Set object set, and false for all the other inputs.

In summary, the lodash _.isSet method is a helpful utility function that can be used to determine if a given value is a Set object. This can aid in error detection, and ensure that the correct Set methods are used on the input.