# Insert a word before the file name’s dot extension in JavaScript?

JavascriptWeb DevelopmentObject Oriented Programming

Let’s say the following is our file name −

var actualJavaScriptFileName = "demo.js";

Following is the word to be inserted before the dot extension −

var addValueBetweenFileNameAndExtensions = "programming";

At first, you need to split() the file name on the basis of dot(.) and then to insert a character, you can use the concept of template variables. Following is the code −

## Example

var addValueBetweenFileNameAndExtensions = "programming";
var actualJavaScriptFileName = "demo.js";
console.log("The actual File name="+actualJavaScriptFileName);
var [fileName, fileExtension] = actualJavaScriptFileName.split('.');
console.log("After adding into the file name=");
console.log(${fileName}-${addValueBetweenFileNameAndExtensions}.\${fileExtension})

To run the above program, you need to use the following command −

node fileName.js.

## Output

Here, my file name is demo124.js. This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo.js
The actual File name=demo.js
After adding into the file name=
demo-programming.js
Updated on 10-Sep-2020 07:07:14