The String substr() method extracts characters from a string starting at a specified position, returning the extracted part as a new string, without changing the original string. A negative value can be used to extract characters from the end of the string.

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

Example 1:

// variables
let text = 'Hello World';
let my_result = text.substr(6, 4); // starting at position 6, 4 characters

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

Example 2:

// variables
let text = 'Hello World';
let my_result = text.substr(-5); // starting 5 characters from the end

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

Example 1:

Worl

Example 2:

World

string.substr(start, length)

Parameter	Description
start	The start position (required)
length	The number of characters to extract; if omitted, it will extract the rest of the string

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