The following code shows how to use includes() method with if.else statement. You can use the includes method with the if.else statement if you want to perform different operations based on the existence of the substring. The code returns the output False as the substring 'sub' is not found in the given string after the position 15. Syntax string.includes(substring, start_index) Ĭode let str = 'Search for sub in the string' Includes() method also accepts start_value parameter to mention from where the search should begin. str.toLowerCase().includes('substr'.toLowerCase()) Using Includes with Position The following code demonstrates converts both the string to lowercase and checks if a string contains a substring. You can check if a String Contains a Substring in a case insensitive way by converting both the string and the substring to either upper or lower case. Output false Check if string contains substring in case insensitive Way The following syntax shows how to use the includes() method.

Use this method when you want to check if the substring exists or not and return a boolean flag as a result. False – If the substring is not available.Includes() method checks if the Substring is available in the String or not. Check if string contains substring in case insensitive Way.

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