startsWith() method is a tool you'll want in your arsenal. In this tutorial, we'll dive into the
startsWith() method, showing you how it can be used to determine whether a string begins with certain characters.
Let's start with a quick peek at the syntax:
By the end of this guide, you'll have a solid understanding of how to use
Here's the method signature:
searchString is the string you want to search for.
position (optional) is the index at which to start the search. By default, it's 0.
Notice how we used the optional
position argument in the second
console.log() to specify where the method should start searching within the string.
Identify the string: Determine the string you want to check. This will be the main string where the
startsWith() method is applied.
Choose the substring: Decide on the characters that you expect to be at the beginning of the main string.
Apply the method: Use the
startsWith() method with the main string and the substring as arguments.
Check the result: The method will return
true if the main string starts with the specified characters, and
Imagine you're working on a project where you need to verify if user input begins with a specific prefix. Here's how you'd do it:
In this function,
checkPrefix, we're checking whether
userInput starts with the
startsWith() is case-sensitive. If you need a case-insensitive check, convert both the main string and the substring to the same case using
toUpperCase() before calling
startsWith() method is not supported in Internet Explorer. If you need to support older browsers, consider using a polyfill or an alternative approach like a regular expression.
Now that you've learned about the
By incorporating the
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