Transforming an Array into a String and Extracting a Substring

Question

Transforming an Array into a String and Extracting a Substring

I started with a numeric array in JavaScript and converted it to a string using the join method. However, when attempting to extract a substring using substr, I encountered a technical issue. Can someone please assist me with this problem?

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));

PLEASE NOTE: The elements with IDs div1, div2, and div3 represent separate divs where I intend to display the respective results.

javascript arrays string substring

Answer 1

Answer №1

When using substr, it's important to remember to apply it to the result of the array.join function, not directly on the array itself. This is because join does not alter the original array; instead, it returns a new string value.

To correctly use substr, first store the result of array.join("") in a variable, and then apply substr to that variable.

var joined = array.join("");
joined.substr(0,3); // this approach will yield the desired outcome

Answer 2

When using substr, it's important to remember to apply it to the result of the array.join function, not directly on the array itself. This is because join does not alter the original array; instead, it returns a new string value.

To correctly use substr, first store the result of array.join("") in a variable, and then apply substr to that variable.

var joined = array.join("");
joined.substr(0,3); // this approach will yield the desired outcome

Transforming an Array into a String and Extracting a Substring

Answer №1

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