The substring() method extracts characters, between two indices (positions), from a string, and returns the substring.

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.

The substring() method in JavaScript extracts a portion of a string and returns it as a new string without modifying the original string.

January 1, 2025 - JavaScript substring() is a String method that is typically used to extract and store part of a string.

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.

March 22, 2020 - This method basically gets a part of the original string and returns it as a new string. The substring method expects two parameters: ... Let’s see the usage in an example. Suppose that we have the example string below: const myString = "I am learning JavaScript and it is cool!";

You can use JavaScript’s includes() method to check whether a string contains a substring.

June 24, 2024 - The includes() method determines whether a string contains the specified substring.

June 22, 2021 - This method extracts the characters from a string, between two specified indices, and returns the new substring.

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.

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April 21, 2020 - For both the slice() and substring() methods, the second argument is exclusive; that is, the resultant substring will not contain the character at the final index.

July 11, 2025 - The main difference is that substr() accepts a length parameter, while substring() accepts start and end indices.

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const splitByNumber = { [Symbol.split](str) { let num = 1; let pos = 0; const result = []; while (pos < str.length) { const matchPos = str.indexOf(num, pos); if (matchPos === -1) { result.push(str.substring(pos)); break; } result.push(str.substring(pos, matchPos)); pos = matchPos + String(num).length; num++; } return result; }, }; const myString = "a1bc2c5d3e4f"; console.log(myString.split(splitByNumber)); // [ "a", "bc", "c5d", "e", "f" ]

May 29, 2025 - The .substring() method in JavaScript extracts a portion of a string from one position to another (exclusive) and returns a new string.

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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.