by JavaScript IndexOf Method The following example illustrates how the JavaScript string indexOf function will search a string to find a specified value:

So, if you want to know if a given string even exists at all in another string, simply test to see whether or not the JavaScript method indexOf() returns “-1”. Being able to access every character in a string gives us a number of ways to work with and manipulate strings. indexOf ('string', 10); // 28 lastIndexOf While the indexOf method searches from left to right, the lastIndexOf method searches from right to left, from the end of the string toward the beginning. After a specified value is found in a string, the function returns the position of the first occurrence.

The indexOf() method signature. int indexOf(int ch): It returns the index of the first occurrence of character ch in a given String. The syntax of the JavaScript indexof … The String.indexOf() Method.

JavaScript IndexOf() method Performs a case-sensitive search and returns the indexof the first occurrence of the specified substring in the calling String object argument,If the character or string isn’t found in the string value, a value of –1 is returned. There are 4 variations of this method in String class:. If it does, then the sub-string … The indexOf JavaScript gets information about the string content. If the specified string not located, the indexof function will return -1. indexOf() method will return the position of the first occurrence of the mentioned text, that is, 7. lastIndexOf() This JavaScript String function will search and return the index of the last occurrence of a mentioned character or substring within the string. If that string does not exist, then it returns “-1”.

Java String indexOf() method with method signature and examples of concat, compare, touppercase, tolowercase, trim, length, equals, split, string indexof in java etc.

It returns the starting position of a string, even if it is one character. Java String indexOf() method is used to find the index of a specified character or a substring in a given String. The first character in the string is H, which corresponds to the index 0.The last character is ?, which corresponds to 11.The whitespace characters also have an index, at 3 and 7..

var str = 'A string to test JavaScript string methods'; // start search at index location 10 var pos = str.

The JavaScript indexof method returns the index position of the first occurrence of a specified string. The String.indexOf() method is much like the previous includes() method (and it's suitable to be used in a polyfill for includes() as well), but the only difference is the return value.