The String indexOf() method returns the position of the first occurrence of a value in a string, and returns -1 if the value is not found. The indexOf() method is case sensitive.

<!-- html element to place output -->
<p id="my_output"></p>

Example 1:

// variables
let text = 'Hello World';
let my_value = text.indexOf('W'); // search entire string

// output to the HTML element
document.getElementById('my_output').innerHTML = my_value;

Example 2:

// variables
let text = 'Hello World';
let my_value = text.indexOf('W', 3); // search string starting at position 3

// output to the HTML element
document.getElementById('my_output').innerHTML = my_value;

Example 1:

6

Example 2:

6

string.includes(searchvalue, start)

Parameter	Description
searchvalue	The string to search for (required)
start	The position to start from (default value is 0)

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