Question regarding JavaScript String.prototype.substring

Question

var alpha = "ABCDEFG";
var result = alpha.substring(0, 5);
document.write(result);

The question is, why the answer is ABCDE(0,4) instead of ABCDEF (0,5). All numbers in programming start with zero, right?

Read this: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Prerak Sola
– Prerak Sola, Commented Jan 28, 2019 at 15:28
First parameter is inclusive while the last parameter is exclusive. — Murat Karagöz
– Murat Karagöz, Commented Jan 28, 2019 at 15:31

Cory Kleiser · Accepted Answer · 2019-01-28 20:59:31Z

2

String.prototype.substring takes up to two arguments. One for the start index one for the end index (optional). While the starting index is included in the new string, the end index is excluded. When 4 is the end index that character will be excluded and you will see characters 0-3

Please read https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring

edited Jan 28, 2019 at 20:59

answered Jan 28, 2019 at 15:28

Cory Kleiser

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