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Lodash _.isRegExp

Overview

The _.isRegExp method in lodash is a utility function that checks if a value is a RegExp object or not. It is a handy method that helps developers to determine if the given value can be used as a regular expression in their code.

The method takes one parameter - the value to be checked. It returns a boolean value, which is true if the given value is a RegExp object, otherwise false.

Here is an example:

const _ = require('lodash');

console.log(_.isRegExp(/abc/)); // true
console.log(_.isRegExp(new RegExp('abc'))); // true
console.log(_.isRegExp('abc')); // false

In the above example, the _.isRegExp method is used to determine whether the given values are RegExp objects or not. The method returns true for the first two values, because they are instances of the RegExp class. However, it returns false for the third value, which is a simple string and not a regular expression.

It is noteworthy that JavaScript provides a built-in way to check if a value is a regular expression - the instanceof operator. However, using the _.isRegExp method is more reliable since it also handles values created in a different window or frame.

Overall, the _.isRegExp method in lodash is a useful utility function that simplifies the code by checking if a value is a regular expression, which would be very handy in web applications where regular expressions are used extensively.