![]() ![]() Finally, call this method with two different words as sub-string to the above main string. ![]() ![]() Simply use the includes() method to the string and pass the search string as the first argument. In this example, our main string is “Hello World”. How to check if the string includes substring javascript.The includes() method helps us check if string contains substring JavaScript using the. This is the most common and widely used method to check the existence of a substring in a string.indexOf() method returns -1 if a substring doesnt exist in a. Print out the message to the user accordingly. const string 'foo' const substring 'oo' console.log(string.includes(substring)) // true includes doesn’t have Internet Explorer support, though. Check if a string contains another string as a substring in JavaScript 1. JavaScript string contains helps you find a character or a substring. If it is greater than or equal to 0, means that the substring exists inside the given string. To check if a string contains a substring in JavaScript, you can use the includes() method of the String object. While it's a simple and common task, the method names often differ between programming languages. Inside the function, check the value of indexOf method. JavaScript: Check if String Contains a Substring Scott Robinson A common operation in many programming languages is to check if a string contains another string.It prints out the result based on subString exists in mainString or not. subString is the sub-string and mainString is the main string. doesExist method takes two parameters.The commented numbers in the above program denote the step number below : 1 function doesExist ( subString, mainString ) //3 var mainString = "Hello World" //4 doesExist ( "Hello", mainString ) doesExist ( "Universe", mainString ) Explanation : ![]()
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