Converting an Array to String and getting a substring

Question

I initiated a numerical array inside a JavaScript and to converted it into a string using join but when I try to get a substr, it doesn't to work. There seems to be a technical error. Please help!

var array = [85, 13, 7, 42, 78, 9];
$("#div1").html("<b>This is the original array:</b><br><br>" + array.join("<br>"));

$("#div2").html("<br><b>This is the converted string:</b><br><br>" + array.join(""));

$("#div3").html("<br><b>The substring (from 0 to 3) is:</b><br><br>" + array.substr(0,3));

NOTE: div1, div2, div3 are 3 seperate divs with ids respectively. That's where I want to display the results.

You're calling substr on the array and not on the result of array.join. The join function does not modify the array, it returns a string — toniedzwiedz
– toniedzwiedz, Commented Apr 19, 2015 at 18:27
you mean if i save the result of array.join in a var result and then perform a var.substr() , it should work? — Sarmad Asif
– Sarmad Asif, Commented Apr 19, 2015 at 18:30
Yes, it should, unless there's something else wrong with your code. — toniedzwiedz
– toniedzwiedz, Commented Apr 19, 2015 at 18:31

toniedzwiedz · Accepted Answer · 2015-04-19 18:43:33Z

1

You're calling substr on the array and not on the result of array.join. The join function does not modify the array, it returns a string

You have to assign the result to a variable and call substr on the resulting string value.

var joined = array.join("");
joined.substr(0,3); // this will work

answered Apr 19, 2015 at 18:43

toniedzwiedz

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