Sign in Welcome! Log into your account your username your password Forgot your password? Get help Password recovery Recover your password your email A password will be e-mailed to you. HomeProgrammingTest if Variable Is a String Programming Test if Variable Is a String By Admin May 30, 2022 0 1 Share FacebookTwitterPinterestWhatsApp Introduction JavaScript helps quite a lot of knowledge varieties similar to strings, numbers, floats, and so forth. A string is a set of characters similar to “John Doe”. Sometimes, you create them by enclosing characters in double or single quotes. Alternatively, you can also make a string through the use of the new String() constructor: let myString = 'John Doe'; let myString2 = new String("John Doe"); When performing particular operations, it’s possible you’ll face a state of affairs that calls for you to confirm {that a} particular variable is a string earlier than processing it – lest an error be thrown. We’ll cowl that state of affairs on this article! First, we’ll check out find out how to examine if a specific variable is a string in JavaScript after which present you another method that makes use of the Lodash library. Customary Answer – Utilizing typeof Operator In JavaScript, the typeof operator is probably the most used technique to examine the kind of any variable. Alternatively, you need to use the typeof() technique: let myString = 'John Doe'; typeof myString; typeof(myString); If used with a string, the typeof operator returns "string". Let’s create a easy instance to substantiate this: let myString = "John Doe"; if (typeof myString === "string") { console.log("This variable is a string"); } else { console.log("This variable will not be a string"); } Certainly, the myString is a string: This variable is a string Notice: Even when the variable accommodates a quantity that’s wrapped in single/double quotes, it nonetheless can be thought-about a string. One fascinating downside with the typeof operator is that it does not acknowledge strings created utilizing the new String() constructor. The new key phrase creates a brand new JavaScript object that’s the occasion of the String kind. Due to this fact, the typeof operator will not appropriately acknowledge strings created utilizing the new String() constructor: let myString = new String('John Doe'); console.log(typeof myString); On this case, as an alternative of the typeof operator, we have to use the instanceof operator – it may detect that the thing created with the new String() constructor is the occasion of the String kind: let myString = new String("John Doe"); if (myString instanceof String) { console.log("This variable is a string"); } else { console.log("This variable will not be a string"); } For the reason that myString is a string, this code will produce the next output: Try our hands-on, sensible information to studying Git, with best-practices, industry-accepted requirements, and included cheat sheet. Cease Googling Git instructions and truly study it! This variable is a string Utilizing Lodash Library If you happen to’re already utilizing the Lodash library in your challenge, there isn’t any hurt in utilizing it for checking whether or not a variable is a string or not! It is completely not essential to have a dependency if we do not want Lodash for one thing else, however, if we have already got that dependency, we are able to make use of the _.isString() technique, which returns true if the desired worth is a string primitive or a String object, making it match for each explicitly and implicitly created strings: let myString = new String("John Doe"); if (_.isString(myString)) { console.log("This variable is a string"); } else { console.log("This variable will not be a string"); } Output: This variable is a string Conclusion On this article, we have discovered find out how to examine if a variable is a string in JavaScript. Additionally, we have discovered how this works with an exterior library like Lodash. 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