But if you are using Internet Explorer or any old browser, we need to use indexOf.
All modern browsers support includes() method. Includes() method is generic and hence does not require this value to be Array object, but can be applied to Array-like objects. EcmaScript 2015 has added includes() for String and EcmaScrpt 2016 has added includes() for arrays. If the receiver object of the method indexOf call has includes a method, with both having the same parameters, it has a suggestion like types, String, Array, ReadonlyArray, and other typed arrays. In some cases, where the user needs the exact location of a specified element, indexOf(element) can also be used to first get the element’s location. If we look at the above examples, the simplest way to check for a primitive value in the array is to use the include() method. And the simplest way to check primitive values in the array to use the includes() method. As TypeScript is similar to JavaScript, it contains few built-in methods to check whether an array has a particular value or object. As arrays are one of the most used data structures in the IT field, while dealing with a list of array items, users must look for a specific value in the array list. 
Rules and Regulations for Array Contains/Includes employeeBoolean3, in which we search for JKL from 4th position, but JKL is in 3rd position, so it returns false. employeeBoolean2, in which we search for JKL from 3rd position, so array includes returns true. So on searching from the 2nd index, JKL is found at 3rd position. Here, in this example, employeeBoolean1, in which we search for JKL to search from the 2nd index. includes('JKL', 4)ĭocument.write("Boolean value1:", employeeBoolean1 + "") ĭocument.write("Boolean value2:", employeeBoolean2 + "") ĭocument.write("Boolean value3:", employeeBoolean3 + "")
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