The indexOf() method returns the position of the first occurrence of substring in string . The first position in the string is 0. If the indexOf() method does not find the substring in string, it will return -1.
Read moreDoes indexOf work on strings JavaScript?
JavaScript String indexOf() The indexOf() method returns the position of the first occurrence of a value in a string .
Read moreCan you use indexOf on a string?
Java String indexOf() Method The indexOf() method returns the position of the first occurrence of specified character(s) in a string . Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character(s) in a string.
Read moreHow do you make a case sensitive?
Both String#includes() and String#indexOf() are case sensitive. Neither function supports regular expressions. To do case insensitive search, you can use regular expressions and the String#match() function , or you can convert both the string and substring to lower case using the String#toLowerCase() function.
Read moreWhat is indexOf () in JavaScript?
indexOf() The indexOf() method, given one argument: a substring to search for, searches the entire calling string, and returns the index of the first occurrence of the specified substring .
Read moreHow do you make indexOf case insensitive?
Yes, it is case-sensitive. You can do a case-insensitive indexOf by converting your String and the String parameter both to upper-case before searching . Note that toUpperCase may not work in some circumstances.
Read moreIs JavaScript case insensitive?
JavaScript is a case-sensitive language . This means that language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters.
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