Btukfyl

Not sure what would perform faster but this would be more reliable when it comes to extension like .jpeg or .html

x.replace(/.[^/.]+$/, "")

In node.js, the name of the file without the extension can be obtained as follows.

const path = require('path');

var filename = 'hello.html';



path.parse(filename).name; // hello

path.parse(filename).ext;  // .html

Further explanation at Node.js documentation page.

x.length-4 only accounts for extensions of 3 characters. What if you have filename.jpegor filename.pl?

EDIT:

To answer... sure, if you always have an extension of .jpg, x.length-4 would work just fine.

However, if you don't know the length of your extension, any of a number of solutions are better/more robust.

x = x.replace(/..+$/, '');

OR

x = x.substring(0, x.lastIndexOf('.'));

OR

x = x.replace(/(.*).(.*?)$/, "$1");

OR (with the assumption filename only has one dot)

parts = x.match(/[^.]+/);

x = parts[0];

OR (also with only one dot)

parts = x.split(".");

x = parts[0];

You can perhaps use the assumption that the last dot will be the extension delimiter.

var x = 'filename.jpg';

var f = x.substr(0, x.lastIndexOf('.'));

If file has no extension, it will return empty string. To fix that use this function

function removeExtension(filename){

    var lastDotPosition = filename.lastIndexOf(".");

    if (lastDotPosition === -1) return filename;

    else return filename.substr(0, lastDotPosition);

}

In Node.js versions prior to 0.12.x:

path.basename(filename, path.extname(filename))

Of course this also works in 0.12.x and later.

This works, even when the delimiter is not present in the string.

String.prototype.beforeLastIndex = function (delimiter) {

    return this.split(delimiter).slice(0,-1).join(delimiter) || this + ""

}



"image".beforeLastIndex(".") // "image"

"image.jpeg".beforeLastIndex(".") // "image"

"image.second.jpeg".beforeLastIndex(".") // "image.second"

"image.second.third.jpeg".beforeLastIndex(".") // "image.second.third"

Can also be used as a one-liner like this:

var filename = "this.is.a.filename.txt";

console.log(filename.split(".").slice(0,-1).join(".") || filename + "");

EDIT: This is a more efficient solution:

String.prototype.beforeLastIndex = function (delimiter) {

    return this.substr(0,this.lastIndexOf(delimiter)) || this + ""

}

I like this one because it is a one liner which isn't too hard to read:

filename.substring(0, filename.lastIndexOf('.')) || filename

Another one-liner:

x.split(".").slice(0, -1).join(".")

Here's another regex-based solution:

filename.replace(/.[^.$]+$/, '');

This should only chop off the last segment.

I don't know if it's a valid option but I use this:

name = filename.split(".");

// trimming with pop()

name.pop();

// getting the name with join()

name.join(''); // empty string since default separator is ', '

It's not just one operation I know, but at least it should always work!

Simple one:

var n = str.lastIndexOf(".");

return n > -1 ? str.substr(0, n) : str;

The accepted answer strips the last extension part only (.jpeg), which might be a good choice in most cases.

I once had to strip all extensions (.tar.gz) and the file names were restricted to not contain dots (so 2015-01-01.backup.tar would not be a problem):

var name = "2015-01-01_backup.tar.gz";

name.replace(/(.[^/.]+)+$/, "");

If you have to process a variable that contains the complete path (ex.: thePath = "http://stackoverflow.com/directory/subdirectory/filename.jpg") and you want to return just "filename" you can use:

theName = thePath.split("/").slice(-1).join().split(".").shift();

the result will be theName == "filename";

To try it write the following command into the console window of your chrome debugger:
window.location.pathname.split("/").slice(-1).join().split(".").shift()

If you have to process just the file name and its extension (ex.: theNameWithExt = "filename.jpg"):

theName = theNameWithExt.split(".").shift();

the result will be theName == "filename", the same as above;

Notes:

1. The first one is a little bit slower cause performes more
   operations; but works in both cases, in other words it can extract
   the file name without extension from a given string that contains a path or a file name with ex. While the second works only if the given variable contains a filename with ext like filename.ext but is a little bit quicker.


2. Both solutions work for both local and server files;

But I can't say nothing about neither performances comparison with other answers nor for browser or OS compatibility.

working snippet 1: the complete path

var thePath = "http://stackoverflow.com/directory/subdirectory/filename.jpg";

theName = thePath.split("/").slice(-1).join().split(".").shift();

alert(theName);

working snippet 2: the file name with extension

var theNameWithExt = "filename.jpg";

theName = theNameWithExt.split("/").slice(-1).join().split(".").shift();

alert(theName);

working snippet 2: the file name with double extension

var theNameWithExt = "filename.tar.gz";

theName = theNameWithExt.split("/").slice(-1).join().split(".").shift();

alert(theName);

This can also be done easily with path using the basename and extname methods.

const path = require('path')



path.basename('test.txt', path.extname('test.txt'))

var fileName = "something.extension";

fileName.slice(0, -path.extname(fileName).length) // === "something"

Though it's pretty late, I will add another approach to get the filename without extension using plain old JS-

path.replace(path.substr(path.lastIndexOf('.')), '')

This is where regular expressions come in handy! Javascript's .replace() method will take a regular expression, and you can utilize that to accomplish what you want:

// assuming var x = filename.jpg or some extension

x = x.replace(/(.*).[^.]+$/, "$1");

Another one liner - we presume our file is a jpg picture >> ex: var yourStr = 'test.jpg';

    yourStr = yourStr.slice(0, -4); // 'test'

You can use path to maneuver.

var MYPATH = '/User/HELLO/WORLD/FILENAME.js';

var MYEXT = '.js';

var fileName = path.basename(MYPATH, MYEXT);

var filePath = path.dirname(MYPATH) + '/' + fileName;

Output

> filePath

'/User/HELLO/WORLD/FILENAME'

> fileName

'FILENAME'

> MYPATH

'/User/HELLO/WORLD/FILENAME.js'

x.slice(0, -(x.split('.').pop().length + 1));

This is the code I use to remove the extension from a filename, without using either regex or indexOf (indexOf is not supported in IE8). It assumes that the extension is any text after the last '.' character.

It works for:

• files without an extension: "myletter"


• files with '.' in the name: "my.letter.txt"


• unknown length of file extension: "my.letter.html"

Here's the code:

var filename = "my.letter.txt" // some filename



var substrings = filename.split('.'); // split the string at '.'

if (substrings.length == 1)

{

  return filename; // there was no file extension, file was something like 'myfile'

}

else

{

  var ext = substrings.pop(); // remove the last element

  var name = substrings.join(""); // rejoin the remaining elements without separator

  name = ([name, ext]).join("."); // readd the extension

  return name;

}

First you have to get correct the extension of file then you can remove it

try this code

<!DOCTYPE html>

<html>

<body>

<p>Click the button to display the array values after the split.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>

function getFileName(str){

    var res = str.split('.').pop();

    alert('filename: ' + str.replace('.' + res, ''));

    alert('extension: ' +res);

}

function myFunction() {

    getFileName('abc.jpg');

    getFileName('abc.def.jpg');

    getFileName('abc.def.ghi.jpg');

    getFileName('abc.def.ghi.123.jpg');

    getFileName('abc.def.ghi.123.456.jpg');

    getFileName('abc.jpg.xyz.jpg'); // test with Sébastien comment lol

}

</script>

</body>

</html>

I would use something like x.substring(0, x.lastIndexOf('.')). If you're going for performance, don't go for javascript at all :-p No, one more statement really doesn't matter for 99.99999% of all purposes.