Understanding JavaScript substring():

 

The JavaScript substring() method is a powerful tool for extracting parts of a string. However, its behavior can sometimes be confusing for beginners. This article will help you understand how substring() works, its quirks, and common mistakes you should avoid.

What is the substring() Method?

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

# Start index: The position where the extraction begins (inclusive).
# End index: The position where the extraction ends (exclusive).

string.substring(startIndex, endIndex)


If the endIndex is omitted, the method extracts the rest of the string starting from startIndex.

 

 

Example Usage

Let’s look at some basic examples:

 

let x = "Learn"
console.log(x.substring(5, 1))

console.log("kumaratuljaiswal.in");

 

 

 

 

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