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How to use startsWith in JavaScript in String

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    Vishnupriya
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How to use startsWith in JavaScript in String

Hey readers, in this article we will be discussing how to use the startsWith method in JavaScript in a step-wise, efficient manner. If you are a beginner and want to learn JavaScript then do check out the course on Codedamn.

Introduction

JavaScript is one of the most used languages when it comes to building web applications as it allows developers to wrap HTML and CSS code in it to make web apps interactive. It allows a web application to be interactive. It is also used for making animations on websites and has a large community on GitHub. JavaScript has tons of libraries, one of which is React which we will be covering in this article later. 

Use cases startsWith in JavaScript: 

  • Building web server and its interactive functions
  • Animations and graphics, adding special effects to web components
  • Validating forms and exception errors
  • Adding behavior and functionalities to web pages

Since JavaScript is a scripting language, it works without any libraries. Developers are free to write JavaScript language code anywhere and can still run it in the browser. There is no structure in JavaScript, the browser executes each line of the code from top to down.

Related Guide –  Constructor in JavaScript 

startsWith method

The str.startsWith() method determines whether or not the given string begins with the characters of the specified string.

Syntax: 

str.startsWith( searchString , position )

Parameters: As noted earlier and described below, this procedure accepts two parameters:

searchString: It is a mandatory parameter. It saves the string that must be searched.

start: It determines where the searchString should be searched inside the given string. The value is set to zero by default.

the value of the return If the searchString is discovered, this function returns true; otherwise, it returns false.

The following are some examples of how to use the method described above:

Example 1

<script>
function func() {
var str = 'Code damn';
var value = str.startsWith('Code');
document.write(value);
}
func();
</script>

Example 2

var str = 'It is a great day.';
var value = str.startsWith('It'); 
print(value);

Example 3

var str = 'It is a great day.'
var value = str.startsWith('great',8);
print(value);

The method startsWith() in this example examines whether the string str begins with great or not at the provided index 8. Because great appears at the specified position in the string, it returns true.

The startsWith() method in JavaScript can be used to see if the specified string begins with the given substring. You must provide both an array and a string as parameters to this function. The final argument specifies whether instances should be taken into account when assessing whether they match (true) or whether simply letter order matters (false). If no third parameter is specified, false is used by default.

Conclusion

This was about the startsWith method in JavaSript using HTML, if you want to learn more about javascript, do check out the article and course on Codedamn of javascript along with the course. Hope you liked this, if you have any queries or suggestions do let us know in the comments. 

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