On the other hand, If extension is given, the method returns the file name without the extension. path.basename(path: string, extension?: string): Returns the file name with the extension if extension is not passed.Finally, we can log the ext to get the file extension.The path module (one of the core modules of Node.js) gives us some methods to simply retrieve the name and extension of a file from a path or web URL: We further extract the ext variable in using the JavaScript object destructuring mechanism of ES6 javascript. The first element of the reversed array will hold the extension value. reverse() method reverses the array on which we apply it. It will include the file name and the extensions returned in different indices of the array output by the.
#JS FILEDROP GET FILE NAME CODE#
The code uses the split(".") function of javascript to split the file name using the "." to get an array of file name parts. let file1 = "somefile.txt" Ĭonst = file1.split('.').reverse() We can use it to get the extension from a file name. With it, we can break open a javascript object and bind these properties to variables. Object destructuring is a newer feature introduced in the ES6 standard. Get File Extension With the ES6 Object Destructuring Method
It is also a faster method to extract the file extension from the file name string. Hence, we can use the method easily without any reservations. slice() function does not tamper with the string on which we apply it. Refer to the following code for using slice to get the file extension. And will return the string from that point. If we pass only one value to the slice() function, it will consider that index value as the start index. It works similar to the substr() function and returns a section of array defined by the start index and the end index. Hence, we can apply the string operators. We are dealing with the string datatype for the file name. let file1 = "somefile.txt" Ĭonsole.log(file1.substr( (file1.lastIndexOf(".")+1 - file1.length) ) ) Ĭonsole.log(file2.substr( (file2.lastIndexOf(".")+1 - file2.length) ) ) is present and then uses it as a reference to return the extension. It uses the lastIndexOf() function in javascript to figure out the last position where the. Else prefer using the following fool-proof code if we are not aware of the file extension length. Use substr() only if we are sure about the length of the extension. Unlike the usual start and end indices, the negative integer value asks the method to display the last few characters of the string as specified by the numeric parameter. let file1 = "somefile.txt" Īs depicted in the code above, the substr() function accepts negative integer values as parameters too. Hence, we can use the substring function for extracting the extension of a file. The function returns the string between the starting and the ending index, including the character at the starting index and excluding the character at the ending index. It takes two parameters, the starting index and the ending index. As the name suggests, the substring() function returns a piece of a string defined by the indices passed as parameters to this function. Another way to get the extension is by using the substr() function. substr() Method in JavaScriptįor extracting the filenames, we employ string operations as we are dealing with the file name string. Hence it is a smart method to get file extension from a given filename. split(".").pop() will return the last piece from the split file name. The approach will work well even for filenames having multiple. pop() function alters the string array on which we apply it. pop() function returns the last value of the broken filename array. split(".") function to split the filename string by.
Let us look at the following code to understand the usage. Hence, we can use a combination of these methods to get the extension out from a file name. pop() is an inbuilt function in javascript that removes the last element of an array and returns it. It breaks the string into an array of substrings based on some pattern that passed as the first parameter to the function. split() function splits a string into an array of strings. Let us look at few ways to extract the extension part from a file name using inbuilt javascript methods. ppt, used to be three characters, but the newer extensions like the. For instance, the older Microsoft office extensions like the. Most extensions are three characters long, but at times it may be more.
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