JavaScript substring

JavaScript String indexOf() The indexOf() method returns the position of the first occurrence of a value in 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.

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.