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If (theString.JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words Output - The character "I" exists in given string. Output - The word "looking" exists in given string.Ĭonsole.log('The word "' + theWord + '" exists in given string.') JavaScript var theString = "I have been looking for Sam." If the value is not -1, the calling string contains the substring we are looking for. This means that you can compare the value returned by the indexOf() method to see if it is equal to -1. If the substring or word is not found, it returns -1. This method returns the index of the first occurrence of the specified substring inside the calling String object. The fastest way to check if a string contains a particular word or substring is with the help of String.indexOf() method. Using String.indexOf() to Check if String Contains Substring Using String.match() to Check if String Contains Substring.

Using arch() to Check if String Contains Substring.Using String.includes() to Check if String Contains Substring.Using String.indexOf() to Check if String Contains Substring.