Char at function to get the character of a location inside a string in JavaScript

<script type="text/javascript">
str='Hello World'
document.writeln(str.charAt(3)); // l
document.writeln("<br>"+str.charAt(4)); // o
document.writeln("<br>"+str.charAt(5)); // Empty space 
document.writeln("<br>"+str.charAt(6)); // W
document.writeln("<br>"+str.charAt(20)); // Empty string
document.writeln("<br>"+str.charAt(-2)); // Empty string
</script>

charAt(): This function takes input number of the location and returns the particular character at that location.

Note that the first character is located at 0th position. Here is an example.

var my_str="Welcome to www.plus2net.com"
document.write(my_str.charAt(3))

The output of above code is c
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charat(): to get character from a location of a string