#Substrings

substring is used to take a part of a string.

Syntax: substring(first_index,last_index).

var a = 'Hello world!';

document.write(a.substring(1,6));

The preceding code snippet gives ```'ello '``` . Note that the 'w' (index 6) is not part of this substring.

We could also do,

var a = 'Hello world!';

document.write(a.substring(2));

This gives the whole string from the character with index 2. ``` 'llo world!'```

##substr

There is also a method substr() that works slightly differently. Instead of the second number being an index number,

it gives the number of characters.

var a = 'Hello world!';

document.write(a.substr(1,6));

starts at the character with index 1 ('e') and then gives 6 characters, so the output is ```ello w```