In older versions of Javascript, we can add a polyfill for include method if (!) 2.In ES5 and before using indexOf method # Includes method is very easy to use and comes with additional options like search position. As we are checking for ES6 substring after position 1. Var isContains = actualstring.includes(substringtocheck,1) If you want to check whether a string contains a substring only after a certain position you can pass the search position as a parameter as shown in the below examples. The second parameter search position is optional and the default value is 0. Javascript string includes method accepts two parameters Includes method is case sensitive, so the below substring check returns false var substringtocheck = 'Includes' Var isContains = actualstring.includes(substringtocheck) Var actualstring='ES6 contains includes method' We will take an example and understand it further.

If you are using latest versions of Javascript like ES6 you can use include method to check if a string contains a substring or not as shown below.

9.Best way to check if a string contains a substring or not in javascript:.

6.Javascript String Contains Case-insensitive check.

2.In ES5 and before using indexOf method.

The hasOwnProperty() method will check if an object contains a direct property and will return true or false if it exists or not. How to Use the hasOwnProperty() Method in JavaScript In this article, I will show you three ways to check if a property exists in a JavaScript object. When you are working with objects in JavaScript, you might need to check if a specific property exists or not.

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