How does a string compare?

Question

What is the comparison here? And why if Z is replaced by O it turns out 1? And if by L, then 0?

var len = 0;
for(let ch of "Solo") {
if(ch > 'a' && ch < 'z')
len++;
}
console.log(len); //3

Answer 1

'S' < 'p' false
'o' < 'p' true
'l' < 'p' true
'o' < 'p' true

Answer 2

There checking " solo" are contains alphabets in between a to z.
If you replace z by o, then 'o' < 'o' is false, 's' < 'o' false only 'l' < 'o' true.
same for l
's' < 'l', 'o' < 'l', 'l' < 'l' all false...

Answer 3

It was only in the morning that I realized why 'A' large is not in the range from 'a' to 'z' . The key to solving ASCII. Thank you all 🤗

Answer 4

Thank you, why if you replace Z with P, then you get 3? Doesn't it give out 2?