What is the difference between alert("abc".substr(0,2)); and alert("abc".substring(0,2)); They both seem to output “ab”.

July 11, 2025 - In JavaScript Both of the functions are used to get the specified part of the string, But there is a slight difference between them. substr() and substring() are string methods used to extract parts of a string.

November 23, 2022 - When in doubt, prefer substring() for its consistency with the standard and its predictable, standardised behaviour. When refactoring legacy code, don't simply swap substr() out for substring() without paying close attention to the parameters. Add a clap for this article.1,3951,395 claps so far. ... Solving the LeetCode Two Sum Problem Using JavaScript.

January 9, 2025 - The substring() is an inbuilt function in JavaScript which returns a part of the given string from start index to end index. The indexing starts from zero.

June 20, 2019 - The substring() function is the most common way to get a substring in JavaScript. It takes two parameters: indexStart and indexEnd. It returns the portion of the string that starts at indexStart and ends the character immediately preceding indexEnd.

February 18, 2019 - This would return “ill” from “Skill”. The 2 tells us where to begin which is the letter “i” and then the 5 tells us how far to go into the string, not how many characters, the ending point. With substring the end character is NOT included.

The substring() method of String values returns the part of this string from the start index up to and excluding the end index, or to the end of the string if no end index is supplied.

January 4, 2019 - The difference is in the second argument. The second argument to substring is the index to stop at (but not include), but the second argument to substr is the maximum length to return.

November 6, 2017 - substr() method is very similar, but the second argument is not for the end index, it’s for the amount of characters.

September 13, 2023 - The substr() method in JavaScript is used to extract parts of a string, starting from the index specified and extending for a given number of characters afterwards.

Both methods can take two parameters, but <kbd class="highlighted">substr()</kbd> uses a start index and a length, while <kbd class="highlighted">substring()</kbd> uses a start index and an end index (excluding).

Main difference between substr and substring method comes from there second parameter, substr(to, length) accepts length of expected substring, while substring(to, from) accept end index, which is excluded.

August 4, 2025 - Both substring() and substr() extract portions of strings, but they interpret their parameters differently.

August 9, 2023 - In this article, we will discuss the difference between “substring” and “substr” and provide practical understanding on how to utilize them effectively. Manipulating strings is an essential aspect of JavaScript programming.

November 5, 2019 - We might think why we need two different methods slice() and substring() as their behaviour is same. It is all about negative indexes. The initial JavaScript created in Netscape 2.0 has only substring() method. If the parameters are negative they treated as 0.

January 12, 2026 - Unlike slice(), substring() has some quirky behaviors that can lead to unexpected results, making it less intuitive for many developers. substring() was one of the earliest string methods in JavaScript (since ES1) and has legacy behaviors that were kept for backward compatibility.

The substr() method is removed (deprecated) in the latest JavaScript standard.

December 12, 2021 - First of all, substr() is considered deprecated and thus not suitable for use in new websites. That simplifies things, doesn’t it?

1 week ago - The substr() method of String values returns a portion of this string, starting at the specified index and extending for a given number of characters afterwards.

August 29, 2016 - Same with substring and substr also. const result = name.substring(1) // ‘ipin’ const result = name.substr(1) // ‘ipin’ ... Great! You have drawn a very good comparison of the various methods to slice up strings in JavaScript.