The includes() method was introduced in ECMAScript 2015. Ĭheck whether a string contains a substring In this example, we have used the indexOf() method to check whether the substring day is present within the given string or not. This method returns -1, if the substring we are looking for is not present within the given string. This method returns the index value or position of the first occurrence of a specified value within the given string.
The indexOf() method checks whether a string consists of a substring. In this lesson, we are going to discuss three methods to check whether a string contains a substring or not, these methods are: We hope this article helped you to check if a substring is present within a string in javascript.JavaScript offers several methods to find out whether a string consists of a particular substring or not. Since the search started from the 18 th position in the second javascript statement, ‘merry’ was not found, and hence -1 got returned as output. search will start from position 18 and return the index of the first occurrence of 'merry' from the entire stringĬonsole.log('We wish you a merry christmas'.indexOf('merry',18)) search will start from position 10 and return the index of the first occurrence of 'merry' from the entire stringĬonsole.log('We wish you a merry christmas'.indexOf('merry',10)) Let us see another example with both the arguments passed. Output:- other is not included in string : We wish you a merry christmas We will be checking if the substring ‘merry’ is contained in the string ‘We wish you a merry christmas’ let mainString = "We wish you a merry christmas"Ĭonsole.log(`$`) Javascript: Replace multiple spaces with a single space.Javascript: Check if string contains special characters.JavaScript: Check if String Starts with LowerCase.Python - Access Nth item in List Of Tuples Python - Check if a value is in Dictionary Python - Returning Multiple Values in Function Check If Date is DayLight Saving in Python.Check if a Date is Before Another Date in Python.Check If Date is Within 7 Days in Python.Looking for Something Search for: Search Recent Posts
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