![]() ![]() indexOf ( 'nice', 3 ) != - 1 //false 'a nice string'. indexOf ( 'nice' ) != - 1 //true 'a nice string'. Like includes(), the second parameters sets the starting point: 'a nice string'. If the substring is found, it returns the index of the character that starts the string. Pre-ES6, the common way to check if a string contains a substring was to use indexOf, which is a string method that return -1 if the string does not contain the substring. includes ( 'nice', 2 ) //true Pre-ES6 alternative to includes(): indexOf() includes ( 'nice', 3 ) //false 'a nice string'. includes ( 'nice' ) //true 'a nice string'. Includes() also accepts an optional second parameter, an integer which indicates the position where to start searching for: 'a nice string'. ![]() This tutorial will guide you through the new. To use it on all browsers, use Polyfill.io or another dedicated polyfill. ES6 includes many new features and syntax changes that make it easier to write and understand JavaScript code. It’s supported in all modern browsers except Internet Explorer: This method was introduced in ES6/ES2015. The most simple one, and also the canonical one going forward, is using the includes() method on a string: 'a nice string'. JavaScript offers different ways to perform this operation. Learn the canonical way, and also find out all the options you have, using plain JavaScriptĬhecking if a string contains a substring is one of the most common tasks in any programming language. See the tutorial on JavaScript ES6 Features to learn more about arrow function notation.JavaScript offers many ways to check if a string contains a substring. The some() method is supported in all major browsers, such as Chrome, Firefox, IE (9 and above), etc. Likewise, two distinct arrays are not equal even if they have the same values in the same order. Because, two distinct objects are not equal even if they look the same (i.e. Var persons = [) it will not work (always return -1). ![]()
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