JavaScript slice() | Slice String

The JavaScript slice() method is used to extract required substring from specified string. For example:

HTML with JavaScript Code

<!DOCTYPE html>
<html>
<body>

   <p id="xyz"></p>

   <script>
      let myString = "JavaScript is Fun.";
      let mySubString = myString.slice(11, 13);
      document.getElementById("xyz").innerHTML = mySubString;
   </script>
   
</body>
</html>

Output

Since indexing starts with 0, therefore in the string "JavaScript is Fun."

'J' is at index no.0
'a' is at index no.1
'v' is at index no.2
and so on

JavaScript slice() Syntax

The syntax of slice() method in JavaScript is:

string.slice(startIndex, endIndex)

The startIndex argument is required, whereas the endIndex argument is optional. The default value of endIndex is the length of specified string (string.length - 1).

Note: The startIndex value is included, whereas the endIndex value is excluded while slicing the string. For example: string.slice(3, 6) states that the character from index no.3 to index no.5 will be sliced or extracted including characters are 3 and 5 indexes.

Note: The string.slice(0, 1) extracts the first character from the string.

Note: The string.slice(-1) extracts the last character from the string.

Note: The string.slice(0) extracts whole string.

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