The value checked by topPage.indexOf() does not need the added comma. The only change was to remove the trailing comma from temp value - your comma delimited string does not end with a comma, so it could never find the last value. String.Search(searchValueRegex) returns an index integer or -1 if the string isn't found.String.Matches(searchValueRegex) returns an array including all matches or null if not found.String.indexOf(searchValueString, offsetInteger) returns an index integer or -1 if the string isn't found.However, you can easily polyfill this method: if (! Klaus is correct that you are working with integers, they arrive at your code as a single string, so it's a valid question.
This method has been added to the ECMAScript 2015 specification and may not be available in all JavaScript implementations yet. For example, the following expression returns false: 'Blue Whale'.includes('blue') // returns false This method lets you determine whether or not a string includes another string. True if the search string is found anywhere within the given string otherwise, false if not. position Optional The position within the string at which to begin searching for searchString. Syntax str.includes( searchString) Parameters searchString A string to be searched for within str. If you'd like to contribute to the interactive examples project, please clone and send us a pull request.
The source for this interactive example is stored in a GitHub repository.
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