Scratch has the "letter of" block: 
Try some experiments - what happens if you try to access a character outside of the valid range, such as beyond its "length-1", or a negative value?
In Javascript, to access a particular letter of a string, just use square brackets.
var name="Mary";
var letter = name[2] // letter will contain "r";
The only catch is the first letter of the string is number zero !
This is a bit confusing at first, but very common with computer languages. Consider a variable called "animal" which contains the string "CAT".
| Expression | Result |
|---|---|
| animal | "CAT" |
| animal.length | 3 |
| animal [0] | "C" |
| animal [1] | "A" |
| animal [2] | "T" |
It's worth noting that for every string, the last character is at position "length-1".
Try some experiments - what happens if you try to access a character outside of the valid range, such as beyond its "length-1", or a negative value?
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